I'm running a 1440 in heavy irrigated beans (60+ bpa). They are matted and kinda green stemmed. The combine has a 20' head, standard rotor, no disrupters. About all I can get is around 2 MPH. I have the concaves at #4, rotor speed around 550 rpm's. Is that about all the speed I'll get? Should I increase rotor speed, or concave opening? This is my first year operating a rotary. All your help is appreciated. I know if it was a conventional I'd increase the concaves and look for beans on the stems. Should I do the same for this machine? Thanks guys.