Slipper Issues

[LiqrSicc]

Any of you guys running the 1520 or larger motors experiencing any slipper issues? I don't know if maybe these motors just have way too much torque but I can't get the slipper to hold. I have the slipper tightened to the point where the the spring is pretty much crushed and I'm still getting major slippage. I can feel it slip on moderate acceleration, even worst if I try to punch it. I couldn't even wheelie if I tried.