Grey Fox, I grew seed beans for Pioneer for about 10 years and had Deere conv. and then R60s and R70. I always had chromed machines and had no problem. I do not know your base setup, but recommend this site under "Tips" topic as a start. Some things are of utmost importance. 1. Have shoe returns to cylinder option on machine. This is an absolute!! 2. Have concave front three rows blocked off with filler strips - available at dealer or make. This may sound backward as you may think this would grind beans, but experience is speaking here. If you have narrow spaced wires on concave, remove every other one. 3. Use generally a slower rotor. Speed up to the point you get a very few cracks, and adjust the concave opening at the place you get most capacity. Capacity is also improved by removing fairings on right feeder housing opening of the platform. 4. High priority also is to have no reverse bars on rotor and have extended helical bar top left of thresher area. Hope these ideas will be helpful.