I have a 2009 FD70 on a gleaner R75 and tonight I was riding in my neighbors 8230 case ih and he has a FD70 on the front of that and his header runs way way faster than mine. The side drapers run faster and the center draper and drum do. Seems to clear the cutter bar way faster than on mine cause the drapers are running so fast. Why does mine run so much slower on a gleaner?