Robert,
I have just heard a lot about it saying that that is a good .46 prop for 3D type stuff. I think it will help some, the throttle was hard to get set right when I was attempting to hover it with the 11x6, it was almost like it was too sensetive. I'm thinking that a lower pitch prop will help with that.

I think the .56 will do fine on it. I know it will fly it fine, it should hover it and stuff too(if you are into that). Besides, if you don't like it, it would be an easy to change the engine.
Alan