mamba monster with a f/7xl

I can fry an egg on my 7XL. To get temps of 150 deg I had to go down to a 9xl with conservative gearing. In my ofna buggy I now run a nemesis xlt motor (1700kv)it has an extra wind for more torque which gave me super wheelie power but shot my temps back up to 185..I used thermal paste on my rcm heatsink clamp and that did nothing ...now I'm strapping a 40mm cooling fan to it hoping for maybe 20deg lower temps.