Hi all we are in 50 bushel wheat has been dessicated we are straight cutting it with a 2588 and the sample is good but could be better too many white caps. Settings are rotor at 1050 RPMm fan at 1000 RPM, bottom sieve at about 5/16" top sieve at 1/2" they are the adjustable peterson (air foil) seieve, have the concave right up at .5 have tried concave open to 1.5 sample was much worse. One more thing there is a lot of straw but ground speed is at 4 mph and this is hard red spring wheat that we are in. Very hard threshing. Any help would be appreciated.