I know it has been discussed here before but it was earlier when corn was much wetter. The corn is 21-22% with a field avg of 210 bu/acre and I am running a 8 row head. If I run any faster than 4.8mph I start filling the cleaning fan. The bottom sieve has been calibrated and I run it on 16 and the sample is very good but for a class 7 machine I think it should have more capacity than 4.8 mph. Is there some upgrade or do I need to set something else different. This is my first rotor I always had JD conv. before so I don't know what to expect. Also I have to run the fan speed slow 800rpm or when I turn on the ends and the combine empties it blows it out the back.Thanks for your help.