Rustler MIP's???

[nitrostarter]

Well I picked up a new set of MIP Cvd's my Rustler. They installed nicely, good look, good fit, seemed strong. So I proceeded to make a couple passes up and down the street. On about the 5th hard pass, I lost power and brakes but could still turn and I could hear the motor rev. So upon walking to pick the Rustler up, I stepped on 1 of the CVD's. I picked it up and it looked like this:




Now I'm assuming the other one broke in the same manner and flew off somewhere. I couldn't find it.

My question here is: Is this the common breaking point for the MIP's? or and I overpowering them?

My setup:
CC Mamba Monster
Neu 1509/1.5D (4500kv)
18/40 Mod1
4s FlightPower 5000 25C
Jaco Foams

Is my setup too powerful? Am I turning too many RPM's?

What would be the next best thing? FLM's?