Very how Clutch bell

[George16]

I recently completed by revo conversion and after running for a minute, the clutch gets up to about 150*F. I'm using a 1515 1Y on 6S(I tried it also in 3S and same results), elektri-clutch, and a 4-shoe clutch bell with .9 springs. I made sure the setscrew is tight. It sounds like the motor is overrunning the clutch so much that the shoes are not biting into the clutch bell but instead just sliding inside heating it up.

Any inputs? Thanks.