Looks like a well thought out list,until you go on a few hunts and start feeling the pain of packing, you won't have the time to contemplate what you really need vs what you are lugging around in your pack.
If you're hunting with a partner, many items can be split... No need to both take a stove or spotting scope for example. How about a shared rifle???
A few things I would leave/change.
No ground fly use a space blanket or something else mentioned (-8oz)
Get a gravity filter such as a Sawyer squeeze filter, they weigh about 3oz (-8oz)
Ditch the "back up water treatment" if you have an issue boil it (-3.5)
Leave the cup, use the Jetboil as your cup (-2.7)
Leave the water jug, camp closer to water. this will leak in your pack... I couldn't fathom pumping 5gallons of water at one sitting... (-10)
One pair of thermal bottoms, if you get cold put on your rain pants (-9.9)
One "mid layer" top (-13.6)
No extra pants, if your main pants get dirty, rinse them out, wear you rain pants, or thermals as they dry (-10.9)
Trade the jacket for a puffy of some sort, use your rain coat over if its wet (-16+)
Ditch the towel (-4)
TOTAL savings... 5.5lbs
Suggestions for gear
I'm not a fan of para cord, I use 3mm utility cord, can be purchased at REI or the like. Its lighter and less bulky.
Not sure what you're hunting, but I'd bring more than 3 blades for the havalon, they weigh nothing.
I'd swap out the game bags for something better. The AK bags will not keep the blow flies off your meat, or the dirt off if you're in a dusty area... Look at TAG BOMB bags.
Add a couple "Wet Fire" blocks for fire starter, they work great to get wet wood going, burn for about 7-9min.
Sun glasses/sun screen (a bright sunny day after a snow storm) I've had snow blindness before, its not fun.
Black tape for rifle muzzle
Include a couple gallon and quart ZipLok bags, to keep your camera and other electronics dry, for storage and what not.
Print only the map areas you will be hunting, go to USGS store and download/print them off.
Any options for a lighter rifle? Maybe upgrade stock, scope mounts, etc (I was serious about sharing a rifle)?
Lighter pack available, or purchase?
I'd include a 2 or 3L Platypus bag in lieu of the 5gal bag, or better yet go with the suggestion on your spreadsheet. The Platypus Gravity works is a sweet setup!
Water needs are subjective, but generally I need 1-1.5L for dinner and breakfast, plus drinking water for the following morning until I find water again. I find 2L is usually plenty if I'm hydrated the day before.
I've not specifically hunted "WY" high country, but have hunted many, many weeks in MT and CO high country in September out of a backpack, as well as Alaska. I've been snowed on lots of times, but can't say that I've ever had more than 1-2 days that it didn't warm up to above freezing. Those storm fronts move through and the "avearge" temps return in a day or two. 95% of the time it will be between 30-70 degrees. For the other 5%, if you can't tough it out with the cloths you brought, walk the 1.5 hours back to the truck. For an Alaskan hunt, the only thing I would add to the clothing list I cut is another thermal top.
I'd be surprised if water was in that short of supply where you want to go. If its really that dry, there won't be many animals around. Later in summer and early fall, the best feed is found near those "wet" areas.
I would surely camp closer to a water source than farther. I much prefer to hunt "up" and hike back down to camp every day. Hiking back up to camp at the end of a day of being worn out sucks balls. Also don't be afraid to move camp when you find a better campsite while hunting. Going light allows this to happen.
My food rule of thumb is 100cal/oz +/- and about 1.5lbs per day. I take a verity of stuff and eat when you're hungry. I don't really eat any more/less when hunting than I do normally. Briefly looked at your food list, wow there is a lot of time put into that one... Let me give you a piece of advice... You're way short on Snickers/Baby Ruth bars... at least 2 per day for me.
Looks like you're having fun planning. Lots of things to consider.
Good luck on your hunt!