Yes, seconding what Villa said - see if you can get yourself a trim chart, and start REALLY trimming your plane, then see what happens when you knife edge, etc. If your engine is screaming with the 11x5 (mine was!) try the 12x5, I think you will love it! I still had a very fast plane, but had more pull (which helps with knife edge and anything vertical). The RPMs will decrease, but I bet after another gallon of fuel they will come back up. I have the 46AX and a 12x5 prop and get 12000rpm on the ground.

pm me your email address if you need a trim chart.

Again, I'm not trying to talk you out of another plane - I'm sure you could handle one and learn a lot from it, but like I said, improving now will help you make a better decision on what kind of plane to get - big difference between an aerobatic plane and a 3D plane, unless you go for something like the Reactor =) Your skills will improve immensely by being able to correct the couplings in your 4 star, and when you move to a more precision plane you will be amazed.