When I put two sets of Dans Sweeps in the seperator side of the rotor that solved alot of ploblems in every crop. It gets the material out much faster without grinding it up. Not sure how much that will increase rotor loss for you. With my 98 R62 I was able to adjust the seperator grate and do the best job on milo I have ever done. I would be tempted to try the sweeps if grinding is your main problem.