[jhautz]

Its the cheat mode that probably killing your battery. You are advancing the timing on the motor with the cheat mode. That takes more juice and creates more motor heat. If you are burning through more with the MMP and CHEAT mode vs another conventional esc then try turning the cheat mode off on the MMP. That should get you back to the same run time (and speed) of the other esc. If you are close on run time you will need to balance the extra power with the amount of juice you are burning. Maybe you can find some middle ground with a milder cheat mode setting that will still get you little extra sped but not burn up too much more power.

Cheat mode will also draw a higher load on your battery becasue of the advanced timing so that would also explain the lower voltage you are seeing.