Dan, From the looks of your gear, you have been out several times. No one ever *needs* to go UL. Do you want to?
If you are serious about getting your base load down to 10 pounds or less, this is the place. UltraLight packing *starts* at 10 pounds. Certainly doable under most conditions.
Winters are much tougher, but still not impossible with 10 pounds. If you are up for this, read on...
1) Get rid of that pack. 63oz is way to heavy. Your main pack for any trips up to a week should never be more than a pound. Some packs are closer a quarter pound.
Extreme example: http://www.zpacks.com/backpacks.shtml
More main-stream: http://gossamergear.com/packs.html
The Murmur, Kumo and Gorilla are all good packs for UL hiking. and weigh around a pound, more if you add in a hip-belt. (I can send you a card for a discount. PM me.)
2) Down Insulation: This is the lightest/best insulating/lowest volume you can buy. This reduces the size of the pack, the weight of both the pack and the gear and does pehaps the best job of keeping you warm. Jacket, bag minimally. Long johns for sleeping or washing clothing. 2 pair of hiking socks. 1 pair of sleeping socks.
3) Cook Kit: Ti Spoon(.3oz), 1L 3.5oz Stanco grease pot(K-mart), pocket knife (2oz)
Stove: 1-3 days: alcohol stove w/"soda" fuel bottle, 5-10 days remote canister stove, 12+ days WG stove.
4) Tarp or Tarp-tent: No more than 24oz for a single person, 32oz for two. Hiking staff(s).
5) 2-4 bandaids, first aid certification. You can omprovise anything minor, GET OUT for anything more and see a doctor or ER. Set up on a trail if it is serious and stay calm, stop any bleeding. Help will usually come in a day or two.
6) Lights (1-impulse, 1-e+light) will last about a week. Maybe a piece of candle. Extra light instead of spare batteries.
7) 2 lighters or 1 lighter and sparker w/tinder
8) Light pad around 10-14 oz.
9) Rain Gear no more than 5-6 oz.
10) Water Treatment: UV, Sawyer, or AM drops. Boil for meals/breakfast.
11) Two 500ml bottles for water. One 2-3L bladder (usually carried empty) will cover most needs.
12) Drop most of the rest of the gear on your list.
13) I carry a Dry/Compression bag for my clothing/bag and a dry bag for food.
14) A ditty bag hs the rest of the little gear, some line, a piece of pencil, a trail journal, a camera, etc.
I think you wil be fine down to about 25F with this stuff for about a week or two. Duration is more a matter of food. My base pack is ~8 pounds, with my Sven Saw, around 9 pounds, and with the SVEA around 10 pounds. I am COMFORTABLE. For two weeks out I add in another 16 pounds of food, or amost double my base weight. This works.