Edit - Sorry, I posted after you made your reply, so I will let it ride....
I have not read all the replies, but
I fit were me, and not really saying you should do all this, just my opinions...
I would buy a lighter pack after you get everything else. Something around 24oz.
As above the shelter could be lighter, IE a gatewood cape or even a
Campmor expended poncho/tarp at 9oz. Someone here just built like a 2.5 oz bivy, and I would definitely take a bivy with a tarp and at 2.5oz maybe with a tent too.
With a bivy a quilt will work. You dont really need a full bag in the summer anyway, so maybe one a tad warmer just in case, like a 32dF nanatuk arc ghost at 17oz
If you are treking those sorts of miles why not just stay in shelters, and there
you definitely want a bivy.
I would carry a half piece of CCF blue foam for legs. You could trim it to fit inside the quilt footbox and it is good for sitting on mid day.
Full piece if you want to protect your prolite and a little extra cushion.
Also at least you have something if your prolite goes flat.
In the summer I think a vest with removable sleeves are better for top insul. More versatile although I have not found a setup I like.
I will probably end up building something synthetic or at least the sleeves.
Knowing me I will lose a sleeve so I better make 3.
I would take wool gloves instead and use them as a pot lifter.
That said you sound like a trail runner so maybe running gloves.
You can do an entire alcohol bag cook kit for less for about 5 oz with everything in a crush proof container.
I would take some sort of knife. From soup to nuts there. A balado is sub 1 oz.
A mora is 4 oz and nice with an almost 4" blade.
I like a swiss army knife with a saw, scissors, tweezers etc.
Maybe also take a very few survival odds and ends, couple of ways to start a fire
like waterproof matches, a striker, some lint, and maybe a few cubes of trioxaine in case you run out of alcohol. Weber fire cubes are the same thing as wet fire and will burn in water and will catch a spark from a dead lighter. Half cube will boil a cup of h20 and they weigh 22g per cube but they will smoke your pot.
You can get them at Ace hardware.
Maybe a few iodine tabs just in case.
Needle, thread, Spare Lighter, whistle, Signal mirror etc.
If you are going to use your aquamira filter like a gravity filter, you will need some tubing and a dirty bag. Best way to fill is have a sealed dirty bag to fill like a platypus and sit on it with your leg. Think I read that here. You could just ditch the filter all together and use chlorine drops or tablets.
You probably want a ursak minor to keep your food in, and mice out.