I have been running an enclosed rotor in the P1 processor for wheat, milo, and soybeans.  Am very, very satisfied with its performance.   I am using standard double-stacked helicals but have installed the transistion kit.  The bottom helicals on the sep. side are left out.  The rotor staying in balance is a major improvement but the enclosed rotor weight is 640 n more than standard rotor.  This extra weight keeps things a turning even when a big bunch comes in...it just keeps on a going and going......