I'm new here and definitely no expert, but I looked at your list and thought I'd add some thoughts. Maybe it'll spark more input!
Some of your optional items:
iPhone - no
Sunglasses - absolutely (unless you have another pair)
Glove liners *and* merino gloves - well, don't bring both. Personal choice. I have poor circulation, so wouldn't go without a pair. I'd choose the merino ones because they'll actually keep you warm if it's cold and they'll work for mosquitoes too. Plus, I don't know about you, but I've had zero luck treating my clothing (socks, pants, shirt, hat) with Permethrin.
Snowpeak 1400 - how many people in your group? You already have the 600 and a bowl w/lid, so this sounds excessive.
SteriPen - I love mine and would probably bring it for 40 miles.
Stuff sacks/dry bags - no/no - I just stuff everything loose into my pack. Maybe a ditty bag or zip lock for little stuff.
Windshirt - not if I also had long sleeves + rain jacket.
Rain Pants - no, you're covered with the hefty rain wrap (which I'd probably leave behind too).
BTW - I know you didn't ask about the rest of your list, but in my opinion your first aid, emergency, and repair kits are excessive. There's not only what looks like a decent amount of overlap, but there's also a whole lot of stuff you won't use. If you leave a bunch of it behind (which I would) the trip is short enough you'd probably be okay (maybe a little less comfy) even if you ended up needing something you didn't have.
I realize you will be fishing, so maybe that dictates some of your gear. I know nothing about fishing, so I'm coming from a non-fisher perspective... but why bring a pocket knife AND your Leatherman squirt? I know they have different functions, but I still can't imagine they are both necessary. Also tenacious tape and duct tape? Waxed string, needle & thread, AND floss? Ditch the emergency blanket. You've got shelter, a sleeping pad, and plenty of warmth in your pack - that's what you'd use in an emergency. JB weld, super glue, AND seam grip (plus the tenacious tape and duct tape)? Soap? Please leave it behind. I know many folks are under the impression biodegradable/dr. bronners is "okay," but it's really not (unless you're planning on using it 200-300 feet from any creek, stream, lake, etc.).
Your trip sounds like a nice distance... and your list is impressive. Have fun!