Common problem on F-2's in corn and the wetter the corn, the worse it is. I always used to throw away those little sliding adjustable augers and replace with full diameter auger flighting from the elevator out to the cross brace in the bin (about 18 to 24 inches) and cover it with a metal tube. Bin will fill more evenly and slip clutch issues will subside. I'm not saying the slip clutch doesn't need some increased spring pressure too, but changing the bin loader auger design is a real positive step to solving the problem.