Most of the time we are running corn head varible toward the top end to get corn head up to speed. At that the chains run back up to fair speed even if belt is moved to corn position on right side. If you have feed sprocket corn strippers installed you may get by at this speed. If you don't have strippers and are overloading chain with material you will be more likely to jump chains on sprockets. That is likly why some people get by better with out moving feed belt over to corn position. Also some guys have large enough heads and heavy enough crop so they don't have varible speeded up so far. I think if we figured out tip speed of cylinder at 200RPM we would find that it is plenty faster than feed chain for corn operation. Best of luck with your wet ground. Take care