Hey Steve,
On the contrary, I might be looking to less prop. It's not a big model. My concept, like any other modelis to get to a point where the model flies at an acceptable speed while keeping the motor running at a speed which is comfortable for it. The margin of available power vs weight is a lot wider than most normal stunters. One thing I did think of was taking the APC you mentioned and chopping it down by 2". I got plenty of props to play with and will be doing allot of test flying but I don't see this thing needing more than 11" prop