Master Airscrew props, especially in the 10-11" range, are cheap. Dirt cheap. Just buy a couple and experiment. Hell, buy a couple APC's in the same range. Have yourself a try-on day, just like a fashion show, and try a bunch of different props (in the right size range) Get a buddy with a tach to see what your engine is turning with various props, you don't want to bog it too much, then go fly. See which one you like best. Use all this info to get yourself into the right range, but use what works best for you and your engine.