I am having the same problem here in 30-36% corn. I'm pretty new at running a combine, but i have figured out already that the wetter the corn, the more it gets mashed in threshing. Somehow you gotta reduce the threshing aggression.
A good test i use all the time is the one in the manual where you kill the engine and stop the machine dead while running at field speed. It really shows you what is going on where in the machine. You can easily see where the fines are being created. Fixing it may be tougher.
I think your settings look good, and similar to mine. I open the concave and slow down the rotor till threshing becomes incomplete.