I'm not sure why your combines won't get 14% moisture out of the head that's nice and dry for us in Canada,,we have no problem at all getting the grain out. If you are looking to solve some threshing problems in wheat and also other hard to thresh grains,, look up Precision Ag parts in Sherwood ND. We bought a whitecap kit from them and some other updates for our 9650 sts and pretty happy with them. They supply speed up kits for back beaters and custom built front and back beaters as well.