There are a couple things to consider. The reason for the 12/12 is not only for speed but prop clearance. Many use this with larger props with less pitch for 3d and stuff but you can't do that with this. The 12/12apc is a very good combination. Also with the engine , prop and torque and all that, you need to keep the idle rpms down low because the plane is light and (overpowered) and will roll away on you,