I'd pull off the pack lid, sherman pocket, and any hip pouches. I'd take 1L of filled water on a day hunt with a few drops to fill up in an emergency and hydrate heavily before you depart and when you return. I wouldn't pack a pump or filter for that trip. Id buy a cheap scalpel blade type knife and that knife with 4 blades will be an ounce or two. Generally I use two blades on an elk and one on a deer. Drop your two knives. I'd probably buy a cheap small/light tripod as well. Id attack weight by the cheapest per ounce at this point in your hunting journey. You probably don't need a puffy in Sep, and can likely leave at the truck most days and get a good light, economical mid layer and shell. Others have already mentioned the TP, thermocell, gaiters, saw, stove, etc... You can probably drop weight and something like Argali or Grakksaw game bags depending on which ones you have. Some are over a pound for a set. Depending on the route, could drop down to just one trekking pole. Your food should be light, in theory you are eating something before you leave and when you get back. You just need lunch and maybe a high calorie emergency bar if you have to rough it out late one night breaking down a critter. First aid kit can probably be reduced to bandaids, zipstitch, tourney, glue, stopclot, and leuko tape. My biggest injury fear is a puncture through a leg or abdomen. Your medkit specs say 2.6-3.6 pounds. That's heavy for one person. That's what I'd have at the base camp or truck.
Keep track of what you bring, and if you don't use it, scrap it for next time with the exception of kill kit and first aid.
I'd add a headlamp if you don't have it. Some cheap and light ones like a Nitcore 20 or 25 worth their weight if you come out heavy after dark.
For reference my 9 day solo sheep pack weight is about 48-49 pounds including all tripod, optics, rifle, 50oz water, and food.