Were these machines all in the same fieldIJ I'm sure you adjusted your speed, clearance, and cylinder RPM to try correct. If you check losses and find them excesive I would consider the stationary rasp bar trick. If you get me your email address I will try find the name and number of a guy in your area that I sent short flat rasp bars too. He was fastening them in for blue grass a while back and he may be into wheat by now. He could tell you how he has the rest of his machine setup also. let us know how you do.