Close your concave as tight as you can get it without it contacting the rub bars. Set the cylinder speed @ 900 rpm, back off speed if grain is cracking. If cracking persists open concave 1 notch. Top siev set at 9_16" wind on high. lower sievs set at 3_8" more or less as needed to get a decent sample. Back section of bottom siev set @ 9_16". open middle and bottom siev if too much is going to rethresher. Good luck!