I agree with that. I'm using the Rasa 20x15 on my Sickle/ Pletty average draw is 3500 mils for the Masters pattern. I'm pulling 75 to 80 maps static.It's a perfect fit for that particular plane. The Sickle has a ton of drag and benefits from the increased speed this prop gives me. It could also be my style that fits the incresed speed it affords.
I'm convinced that some of the larger APC props are flexing at the tips and have caused some violent worrble situations that when it gets going will pull the motor right out of your plane. I know of many many guys who have ejected motors and everyone I know of was using an APC E. style larger prop. I'm thinking their not stiff enough. But hey that's my opinion based only on what I've observed.
Mike Mueller