10L gearing question

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I was having trouble with my esc overheating so I got a fan. ESC is fine now @ 110f, but the motor after 20min was 200f!! I have a Hacker Master Comp and a Fiegao 10L with a 10/51 gear combo. Should I gear up on the 10L motor? Does the 10L like heavy loads more than high rpms?
I do have a 13lb emaxx with 40 series mulchers, are the wheels/tires too heavy for this motor? I'm gonna try stock Revo tires/rims and see if it works any better, but only after I play with the timing/frquency settings on the esc first. Testing takes awhile as I only have one set of Lipos for this truck and they get so warm I'm afraid to charge up again in the same day, so it's only been one test a day so far.