I fly a lot of 3D and I like to have my engines revving on light props. Why, I want a faster spool up time. You rarely use full throttle except on pull outs and the odd vertical manouvre but you want that engine running at or near peak torque.

Try a 15 x6 Zinger or a APC 16 x 4 wide. Maybe even a 15 x 4 Zinger.