I have an OS .32 on a profile hots. Flying weight is 3 lbs 4 oz. Prop is APC 11x3. Hovers at about half throttle and gives great thrust and acceleration. I think the engine winds up a little faster with the 3 pitch rather than the 4. Don't worry about overreving the engine with the 3 pitch because you are only wide open when bailing out of a manouver or climbing.

Ryan