3s Lipo enough for 10L?

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I just got a feigao 10L to replace my old C50 Maxx. I'm still using the Hacker Master Comp controller with 4s 6000 lipos but it keeps getting too hot and shuts down.

I managed to get motor and battery temps reasonable by gearing 16/51 in my sorta heavy Supermaxx with 40 series tires/wheels, but the controller shut down after 5 minutes with 158f at the heatsinks. Motor was about the same. Truck was incredibly fast though!! At 14/51 the truck did run longer, but the motor temps were up around 180f.

I've been playing with the timing, but don't know how that will effect the controller? Stock for Hacker motor is 2-5 degrees timing -- I can't remember the frequency -- it was low though. Setting it to 18 degrees and the next higher frequency seemed to really wake it up, but the esc got hot quicker. Does changing the timing/frequency put more/less load on the esc or just the motor?

Since motor temps seem to be in line I'm thinking that maybe I'm just running too many volts through the master comp? It's designed for 10-12 cell nimhs, so I was thinking a 3s lipo would give me enough juice but be cool enough not to cook the esc? Nimhs are just too heavy and not enough runtime...

I know people run more cells though, how do you do it?