Low/no cost additional weight savings:
>Line pack with trash compactor bag instead of carrying pack cover. Cheaper, works better, saves 1.6oz
>What size fuel canister is that, 110 gr /3.88oz net weight or large? If the 110 gr, my scale gives 7 oz full weight and 3.1 oz empty. I only count the empty weight in base weight. Helps separate BW from consumables, IMO. Used properly, the 110 gr canister should be just fine for 2 people/3 days IME. Research windscreens for canister stoves.
>You could play with a MYOG alcohol stove. Lots of instructions online. Free. Saves maybe 4-5 oz.
>Okay, where'd you get the light Gatorade bottle? Mine weighs 1.9 oz :)
>I'd use a bandana instead of a pack towel--same weight and multi-use.
>Nix spare boxers. It's only 3 days. Save 3 oz.
>Nix spare t-shirt (you already have base layer and midlayer) Good rule of thumb is only take as much clothing as you can wear at once, with (maybe) a spare pair of socks. Save 5 oz.
>Leave rain pants when chance of rain is low.
>I assume water and food weights are split between two. Water weight is easy to adjust on trail and you'll figure out a good balance for conditions. Food weight is heavy though--more than 2# per person per day (PPPD), and remember, both your start day and end day are unlikely to be full food days (all three meals). I shoot for 1.4# PPPD (Mike Clelland!s formula) at apx 125 Cal/oz. Since you're a member, you have access to his article:
You could cut 19 # food for two down to 7-8# for two--that's serious weight savings.
That should get you another 10-12 oz off BW, plus big savings on consumables.
But as Luke says above, what you have is actually a pretty solid list to get out and start hiking, trying out the new lightweight (if not ultralight) kit. Have fun, and be sure to post trip reports!