I've tried a few things myself for feet that sweat at the mere thought of sweating.
The first thing I tried was a decent Merino Wool sock from L.L.Bean paired with a THIN polypropylene sock liner. The results were excellent in water & air temps in the 30's all day.
Then I discovered products from a Swedish company called
Woolpower. Their products are excellent and are available from several retailers. I get my stuff from a company called
Winter Outfitters in Mechanicsburg.
The first combo I tried was an 800 gram Arctic sock with the same polypropylene sock liner...
Even better than the Bean sock.
Just a year or so ago, I tried a thin Woolpower wool sock liner with the Arctic sock...
Excellent combo, better than the polypropylene sock liner!
Right now I am totally satisfied. Do my feet still sweat? Yes, but my feet don't get cold because in either case, the liner wicks away the perspiration from my foot.
Of course if you are wearing waders with Neoprene booties, you will not get any significant evaporation which helps a lot, but wool is ALWAYS better than cotton, even with Neoprene.
The other HUGH issue is making sure whatever you use doesn't make your footwear tight. In other words, you need circulation to your toes. If you can barely get your foot into your boots or wading shoes, your feet will get cold no matter what you do. It is for that reason I buy all of my wading shoes large enough to use with heavy socks.
FWIW - Winter Outfitters usually has a booth at the outdoor show in Harrisburg if you go.