L2 cutting soybeans. 3/4" 620 cyl spd. I have the perforated door in the clean grain. Do I need to take out the sheets under the sieves. Cracking more than I like. Will the cut out cylinder bars help this. Do they also work on Milo and wheat. I don't seem to be running much grain in the return just hulls. I have an air foil chaffer with the fan set on 6.5. Any suggestions.