I have a new 7120 with a 40ft draper that I am having trouble losing grain over the sieve and I am looking for some advise. I a 1 5/8 cloz pre sieve and top sieve and 1 1/8 bottom sieve. pre sieve is at notch 3 top sieve setting is at 10 bottom is 7 in cab. rotor 980 fan 770 concave 11 tailing's are running about 30% and 80% engine load. I can only get 2.5 mph before I really start throwing it out the back and it don't seem to matter if I am in 60 bu or 80 bu wheat. the rotor loss is zero it is all coming of the sieve I have tried tighting the sieve more, opening the sieve more, more wind less wind can't seem to stop it. The only thing is that it seems like when I go down into a low spot the loss go down allot when I am heading down hill so I am thinking of raising the back end up one more hole on the axel. It is set to where the book says it should be but has anybody went a little higher?