Thank you for those insights.
Tarptent: I have been thinking about entering the world of tarps. From my experience I sometimes prefer to just cowboy camp when I know its going to be a clear night. One of the reasons I thought a fully enclosed shelter was necessary is because of mosquitoes. I'm going to explore the pure tarp option moving forward though.
Extra socks: Could call this an optional item. I try to keep my feet dry/warm and this helps at the end of the day. I switch back and forth every day after washing/drying them.
Trekking poles: I'd love some LT4s but this choice was a frugal one. I figured since they are not pure carried weight, I could afford to put up with heavier. They were the best choice I could find at the intersection of price/strength/weight.
Rain Jacket: I sold my Patagonia rain shadow recently because I almost never wore it and it was almost 12oz. Instead of Poncho tarp I could do Dri Ducks. I thought maybe i'd get the poncho tarp and start using it as a shelter to see how I like tarp camping.
Last summer I weighed my food and actually brought 15oz per day. I never really felt hungry although it was less than I typically eat. (5'11" 190lbs). I can't remember the calorie amounts. I wasn't really doing extremely long hard days though, so thats probably the difference. If I plan a trip with longer distances I better plan to bring about 1.5# per day. Now that my gear list is getting pretty dialed in, I want to start improving my food list.
20oz of water usually works, but yes depends on the trail/season. I've gone with a 32oz bottle and never had a problem in between refills if I used some wisdom.