9770, round bar concaves set at 20mm, rotor at 300 rpm, fan at 950, top sieve 18, bottom 10mm. Corn is making around 80bpa, 12% moisture, running 7mph with 12 row. I have the general purpose sieve, not the deep tooth. It is throwing corn out the back, little more than i would like. The chaffer loss bar graph stays at about 24%, but the seperator bar graph on the right stays at 75% or more, so i figure what is on the ground must be comign from the rotor. I have slowed the fan down, slowed rotor down, etc and it doesnt seem to help. what am i doing wrong? Any help would greatly be appreciated.