what fan for feigao and heatsink/clamp

Hi guy's, I want to try and strap a fan to my 8xl with rcm heatsink/clamp and don't know what fan to use. Something bigger than the one on my mm and can handle 14.8volts. After ten minutes my motor temps are still hitting 185 deg (even with low gearing). I run a 4s 6000 pack and I'm forced to shut down before the runs over. Anyway if anyone has a fan in mind or has one on their set up please lmk thanks.