Good for you on your Chewuck tag. Our group has hunted that area since 2007, mostly the northern portion. We moved form Perrygin to Chewuck after the Tripod fire. It was a great move, many times tagging out for our group. Just like you said though, not as good as it used to be. But, should be a great late tag area. We hunted mostly from Thirty mile area to Corral Butte, Longswamp, Hikey Hump, and a few times to Windy Peak. Of course many more areas up there.
Sadly with the the Department.of Wildlife favorites, wolves, cougars and anything that can screw up deer hunting has changed it all.
I would caution you that weather can really change fast. We camped at 5600 feet and were run out a few times with snow, 2 feet of snow can change everything. as I said we were in the northern end of Chewuck.
One thing that surprised us was the amount of moose we saw in the first 10 years up there. They were everywhere. That changed over time and see very few now. Mostly none.
Good luck on your hunt, best time to be there for sure!