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Mod .8 is your gear pitch. I just looked it up. Id get an 11T, 13T, and a 15T mod .8 pinion gears. You will also need a temp gun. Id put the 13T on first and check motor temps periodically while running. You really dont want your motor to go over 175-180F. If your still running to hot after that...

What gear pitch are you running?

You need to get a smaller pinion gear. Sounds like one thats a few, if not several teeth smaller than the one you're using now.