I run the concaves as wide as possible to increase capacity. However, don't get too excited and open too much. Because if you plug the crop has nowhere to go. I run the rotor at 500 rpm in low gear. I run with an air foil chaffer. Run the bottom sieve just barely open. Fan speed is the real question. I have ran at as low as 400 and as high as 550. I look at the sample and make my decision then. I look to combine canola a little on the dirty side, a few pods and small stalks. Hope this helps.