We stuck three Trackstar motors on the Motolyser (sp). At the + sign they were between 44 and 53 degrees of timing. Those are really where the motor produces at about max efficiency. So with that said, adding more timing is probably not beneficial. There lower speed is from a high resistance stator (compared to other motors in the wind). I had a interesting back to back last weekend. I ran one TS 21.5 for 6 minutes and it was 125 deg. I switched to another that showed 4 degrees more timing. After a 6 minute run it was 165 and actually ran slower. I ran the same gearing with each. Next step will be to check the resistance of the stators. The rotors feel similar but I will check them also.