Actually a nice gear list!!
A GG Murmur weighs 6.8 oz in without some of the extras and is same capacity as your ArcTeryx.
- Savings = almost 11 oz.
I don't like the Z-Lite pads because they are difficult to pack. I would use a GG NightLight Torso pad and use it as the back pad in the Murmur also. Weight = 3.5 oz.
- Savings = 5.5 oz.
Since you are in Washington, bug shelter is needed. Good shelter system. Have you over stated the weight for a solo cuben tarp, or are you including the guylines?
You could save a little by using tablets for water purification.
Too many fire starters. Just take the BIC
- savings = .5 oz.
Arc'teryx Atom LT. Replace with Montbell Ex UL Down Jacket @ 6.1 oz.
- Savings = 6.6 oz.
First aid kit seems kind of robust. Could save an ounce.
Looks like you are packing a spare shirt and spare Capilene underwear. Not needed.
- savings = 6.6 oz.
Total savings = 30.7 oz. Almost two pounds.
Also, it looks like your are an organizational type with all those suff sacks, plus the pack liner. Additional weight savings here. It takes time to change. For many years I used a Kelty external frame pack with 7 large exterior pockets. It takes time, but can be done.