I've tried a lot of different setups on my Hyper 7. Always had hot weather issues to deal with here where I live. The combo that I have now I really like. I'm using a Quark 125, Neu 1515 2200kv I think it is and 12/52 pinion/spur. Now that it is winter I could easily go up on some teeth on the pinion.

When I tried a 9L it seemed to run very hot. Maybe a 10L or an XL would be better.

Let me know if I can help you any more.