Dawn,
You’re starting with a solid mindset and mine is just another view to consider, under 10 and under 7 are certainly done and doable. I was cold often with what I had, its something that you get used to and deal with, but when home my instinct is to want others to be aware of that.
Ditto what John said about water- I was probably too precious about water, not wanting to run out or rely on caches, ever. I rarely arrived thirsty or tanked up though. My math was 1L = 5mi + 1-2L for camp, a bit less depending on heat. I definitely still took 6-8L a dozen times. Think about the 20+ mile carry that you get to at 3pm. Do you wait, do you have enough capacity for 20 miles plus camping? Is that source good, since the last report was 3 weeks ago. 4 may do it for you, many people took more often. It is smart to treat the caches as dry, and maybe take a liter only if you’re running low.
On the jacket, I saw 4oz and took that as total. My rab was from gearswap so I don’t know what fill, and has a total weight of 12.5oz with a hood. What you have may be enough, I was reacting to seeing one 4oz insulating piece.
172 total days, 11 zeros ( 5 were for High Sierra Music Festival!) 29 near-0’s (under 10? I forget) 161 days hiked 16.5mi average on days hiked. My fav resupply was 10×10 in (or whatever I had left) – stock up, and go back out for a few miles. Lots of people spend a surprising amount of time in town (hyoh), I decided to prioritize going back out. Having done a big hike you will probably start faster, I didn’t get up to 20’s right away then that became my target (30s and a few 40s in Oregon), slowed down in the sierras. If you’re looking to try for a big day 50mi into Timberline is a good push, most of it is pristine graded monotonous pine forest worthy of racking up a big personal best.
Siesta was my favorite way to tackle the longer carries, though not always the way it happened. Arrive at water in early afternoon, filter and cook dinner as lunch in the (made) shade. Shade is listed as an amenity on the maps, because you have none between in some spots. Tank up and hike til dark, its nice to do 2x 10mi this way without getting too much sun.
I realized at some point that it was worth it to tank up in the afternoon and be ready to camp at a secluded view spot, instead of plop down with 5 tents wherever the water was for that day. The initial strategy is water-to-water since its a big deal, but if you relax that a bit there’s epic spots walked by every day. Up north, look for the little deer trails to camp sites just off the path but out of view.
Drakesbad resort is worth the stop, shower, epic dinner and an evening in their hotspring pool. They seemed to want to stay not the main destination of the area, with a few hikers stopping each day.