ok so this is my first post and I really havent been into ultralight for all that long. I think theres a few items in there that are superfluous and a few things that you could lighten up on. I'll just go through the items in your order and put my 2cents in.
the pack is really one of golites heavier ones. I do like golites race packs but theres just a little too much weight in there for me. If you like golite try the breeze pack. I think its a good balance between size weight and endurance. I believe guru ray used one for a thru hike. if your into something even lighter try one of Glen Van Peski's packs www.gossamergear.com .
well you have a lot of double ups here. the point of having a poncho tarp is to do away with the need for too much rain gear. if you are using a ponch tarp you could just as well go with only the reed pants, if your really that worried about getting your legs wet. I like the idea of an umbrealla and wind shirt, but the thing is, because I live in australia and the weather isnt so bad, rain and extreme weather wise, i dont need anything more than a montane lite speed, i weigh mine in at nearly 6oz. a possibility there is to switch to a montane WP/B jacket or one of the REI WP/B jackets which are also around the 6oz area. this would cut your raingear in half. the stuff sack can be dropped if you have mesh on the outside of your pack to put your jacket in ala breeze g4, g5, mariposa.
I dont know all that much about insulation in clothing because my weather is usually only in the high 30s in the worst of winter. but i think the switch to the cocoon is pretty good. you could switch over to some of the possum down gear for beanie and gloves which is pretty good weight and warmth. unless you are doing a serious cold hike you could probably lose the VB gloves.
I dont know a lot of that stuff but what I can say is that when your hiking in the bush/ back country your allowed to smell like a yak. so drop your spare clothes all together. usually i take a thicker weight sock to put over the top of a light weight ankle sock or equaivalent. this reduces blisters in boots but i think it can be carried over into UL trail shoes. take 2, wash one pair of the thin socks every day and let them dry for the next day. use a garbage or turkey bag to line your pack. just as waterproof. but much more adjustable and replaceable.
Its ok here but i think maybe going for the winter bivy could have cost you some extra weight in that you have to carry another ground sheet. the vapour bivy from bozeman and the oware bivy use a silnylon as a base and are more breathable. have you considered using one of gossamer gears ground sheets a bit lighter i think. im really big on quilts and im just waiting to buy one of rays kits, you could probably get a 20degree one much cheaper than a lot of other bags out there. Its much lighter and efficient than others. also drop the thermarest and pick up a closed cell foam pad the blue ones are cheap and good but i think the evazote ones from gossamer and www.nunatak.com are much warmer and more comfortable.
you are carrying a lot of water bags like i do but i think maybe you have gone a bit too much on the hose system. whilst a hose helps conserve energy it also increases weight. for a short distance hike less than a week i would use an ordinary pop lid, longer hikes would benefit from a hose, i believe theres problems with hoses in snow too. filterwise you could save a bit. aqua mira is good but the gravity filter seems that you are going a little overboard. use a bandana to filter, or a small bottle insert, in australia we have a little filter that sits in the cap of a bottle and goes down into it a bit that weighs in at .5oz. it gets rid of a lot of dirt and taste.
poncho tarp = good. i dont use one myself yet but i can see myself heading that way when i want to get below 4lbs. do u really need 12 stakes? i think you can get away with about 8 in most cases. do you really need all that triptease? i think if you cut exact lengths plus a bit and then learned some basic knots you could escape that overkill of rope. that is unless you are bear bagging with it, which also isnt a problem in australia.
im not going to say much here because i think its a really personal area. i myself feel fine only carrying a few bandaids, a few iodine and alcohol wipes, a lance for splinters and sewing, and a valium or two for pain and sleep. i can see you have some things there that would really come in handy if you really got caught but i really dont feel i need take all that much. use TP and clothing or duct tape for big wounds if you need it. you would need a few extra of those things for long distance such as those for stomach upsets. i always find it nice to take a vitamin suplement every other day on long hikes.
if you use toothpowder thats good. for a toothbruch u could try using one of the prison finger brushes they seem to be ok for short distance or for longer distance try using one of those smart bruches with the toothpaste in the handle. remember to cut down and hollow out all things with handles like that. pack towels are only need for long hikes i reckon, and you may be able to use your spoon or a stick as a trowel. TP, i havent seen much writing on this except that most ppl use shop towell. i myself use 4ply deluxe TP, because of its thickness you can easily get 3 wipes from one sheet with some clever folding, it also depends on your toilet habits as well. when im hiking i can go several days without needing to go. so i usually pack about 3 squares per day just in case.
largely personal again but try a snowpeak600 cup for solo or a msr 800 for 2. replace the lid with alfoil. switch to a aluminium can stove and aluminium wind sheild use small platy for fuel. try and find a lighter spork or possibly use small platic disposable ones and use a tent peg to stir meals (anyone else do this?). try possibly using ziplockbags to cook with only use your pot for boiling water, tea and drinking. i think its nice to use ziplockbags its much cleaner and its not all that much added weight and certainly less water demanding and soap suds etc. i like the idea of stopping and boiling water and putting it into a ziplok bag putting it in some warm clothing in your bag and walking a few more miles before you sit down to eat it. if you have a dog u may need the bowl but u probably dont need to use all three bowls.
long distance hikes might be made more enjoyable with a pen and pad but unless your a writer or really enjoy taking notes in the field like i do, its probably not necessary to take them, or at least only take a few pages. as for fire, i see a lot of people using matches and i dont really like the idea, too easily dammaged. try a small lighter and replace it all the time. weighs only .05 oz more. even better learn how to make a fire from sticks alone. i think you have too many knives, maybe switch to just using one. gps is increasingly becoming more feasible but it hasnt yet become necessary in most places in australia.
how much light do u need? i would think about taking one white and one red led photon microlight, plenty of light but may need battery changes on long distance, you should also remember that our sight is usually ok at night so try not to go overboard on light usage when its possible to see reasonably well without it. and more rope again? try not to double up.
ok so thats it, i was pretty harsh i think, but even a few of those changes could save you some weight, maybe even below 10lbs. i havent put up a gearlist yet because i havent finished putting it into a spread sheet but i would hope that you could tell me what you think of mine when i put it up. as you can see ive gone and put down all sorts of expensive stuff but you should definitely try and make some of your own gear to save money and specialise it.