Now I can say the motor and controller are working togehter with a 20 serial cell lipo battery, it´s turning to maximun speed. So I think it´s not a problem with my 22 serial cell battery. I took the high speed option of the controller.
Andreas
P.S. I know the powercroco-site and his owner ralph very well. He has build some motors for my radio controll aerobatic flight modell with a power of 2,8kw. I´m using this in aerobatic competition. Ralph knows really a lot of electric motors!!