Do you still run the airfoil chaffer? If so how do you like it? I'm in NW Kansas and we are running a 32' Shelbourne on an 8120. We have issues with rotor loss in wheat over 60 bushel per acre. Long story short our sieve is worn and we are considering an airfoil chaffer. Do you have any idea what the max capacity might be? We are trying different rotor bars and modules this year and hoping it will help our rotor loss...it helped a guy a couple towns over and it is how the local dealer is setting them up now. They say 7 mph in 90 bushel wheat. Where do you run your fan speed? I would like to know the pros and cons of the airfoil there are none around that I have heard of.