here are the settings on the mmp:
auto lipo cutoff
with reverse
100% brake
0% drag brake
100% max forward power
50% reverse
punch control disabled
high start power
sensored only mode, cheat mode disabled
linear throttle/brake curves
timing advance on the back of the motor is set as high as possible (20 degrees or so)

if the motor is getting old would replacing the rotor bring it back to life, or would it be better to just get a new one?