How many people are running fans over the motor? I want to run my D413 this weekend but probably won't get a chance to get a fan until next week and I noticed most guys are running motor fans (I've always run them on ESCs in wheeler, but never on the motor). Any ideas on gearing for a 6.5? It looks like it goes anywhere from 21-24. I was thinking of going with a 22 and going up to 23 if temps looked decent.