Those numbers sound pretty good to me at this stage, but you should start peaking the engine now for short bursts and cooling down. You could help the engine break in faster by bench running using a 14x6 prop cut down to 10 inches and balanced to get it up to rpm quicker.

Otherwise, just put it in a plane and fly, as flying is the best way to break in a motor. The 12x6 prop is a good choice for flying , and as the engine breaks in it will develop more power. HTH