I hear ya on the cooling issue, I think I've got enough airflow thru the fuse right now, everything stays really cool, even after 75% full throttle flight for 6-7minutes.
I'm also looking at the Neu motors,like a 1110x1.5y or even a 1112x2d, but they aren't cheap.
The airframe on this thing is so smooth It has tons of speed potential I think with the right set-up.