Combines Still Have Some Rotor loss

I have a 2366 and i run in wheat the concaves at o or closed right up and rotor at 1000 to 900 vanes in centre first concave blocked and small wire in the other 2 concaves and do not have very little rotor loss to speak of.Have specialty rotor and key stock grates, the tigher you have the concaves the less you are going to break up the straw if you are cracking the wheat then slow down you rotor speed or the straw is breaking up too much.Hope this will be of help BOB