Just max out your throws and move the CG back like mentioned above. I can't stand the 12.25 or even 12 inch props for the Pro .46 and I think it's too big for decent throttle reponse, which is much more important than pure thrust. Try an 11.5.4 APC...The 11x5 or 11x4 are also great choices.

The Tower Hobbes muffler is a good thing to try. Best $13 I ever spent!