I am having trouble with rotor loss on flax. The flax has been sprayed with roundup so there are no green bolls. I have no loss on sieves just on the rotors. Should I try taking the cover off the back beater? I have the rotors right tight and and max speed. Maybe slow the rotors down? Going from a tx to cr, all new to me. What are you guys running for fan speed, bottom sieve setting and top? Thanks!