Uh oh, rpm counts... Here we go again.

Anyone care to tell how much actual thrust they provide and where the torque peak of the engine is that you want to match rpm to? Better still, at what rpm do the prop blades stall during the static rpm tests? BTW, those stalled blades righteously screw up extrapolated static thrust tests. What prop(s) provide the greatest efficiency at what rpm? You don't know what you don't know, and where prop performance is concerned, most don't know quite a lot.

Buy it and try it. The plane will tell you what's does the best. Each plane is different from another due to weights and set up, so what works for Harry may not work as well for Dave.