FLM BL Savage woes..PLEASE HELP

[plaviblue]

Hey all, new here and need some help. Here are the specs so you can ponder as you read.

ALL FLM savage
Diff's-- stock
Tires-- Big Joe
ESC-- MMM
Motor--- Feigao 9xl
Spurr--48t
Pinion--10t
Batt-- Apache 4s 3700mah 20c lipo
tranny---3 speed

Here is the story....Truck origionaly had 16 pinion and 6 cell lipo and smoked the MMM on first run(was stupid fast though). Bought a new MMM and changed the pinion to a 10 tooth and set my radio for a 90%max throtle. All the MMM settings are stock except the reverse is shut off and the auto-lipo setting is on. After about a good 10 min of checking the temps every 30 seconds the motor got to 200F and the battery was about 135F. I stopped running it after that. It seems like there are several people here with about the same setup running the 16t pinion and not having any problems. I keep thinking the the cheep battery is the problem. What do you guys think???????
thanks, eric