The Stoic Wrath is around 2oz, not 4oz.
The best way to drop weight from that list is in the extra clothing. Wearing a long sleeve with a deep chest zip will be more versatile than a short sleeve shirt.
Get rid of the following:
REI Middleweight Underwear zip top + bottom 14.00
Shortsleeve golite runner 4.00
ExOfficio Boxer Briefs 2.00
Sawyer Squeeze + 2 liter Bag 4.00 - use chlorine dioxide tabs
Sea to Summit silk bag liner 5.0 - cheaper/lighter to order a warmer bag
GSI minimalist 6.00 - get something lighter
Bic Mini Lighter x 2 0.80 - one should be plenty, you have your matchbook for backup
For hydration, check, but there should be plenty of water along the way, so use two thin-plastic .5L bottles (~1oz total) and bring your 2L platypus and boil water for evening/overnight treatment and cover you over longer distances. You'll be forced to carry less water this way, unless you truly need it, which means you'll lose more weight than the base-weight numbers show.
Before you object to leaving the extra clothing behind... TRY it. If it doesn't work for you, you'll still have a good time. If it does work for you, then you've shaved almost 1.5lbs!
FYI, hand sanitizer is more environment friendly, despite what the Dr Bonner's bottle says.