I have used the TT Pro .46 for some 3D stuff and I always like the 11x4 APC or MAS props on it. The 12x4 props just didn't have the pullout I like. I would also try a 11x5 if you can find one. I would also reccomend trying the tower muffler. It is cheap and sounds great!
http://www3.towerhobbies.com/cgi-bin...&I=LXJB16&P=ML

I am very suprised you were able to fly the plane with the CG that far forward. No wonder he crashed it!!