Re: Prop on a Grady white?
We still don't know what your WOT rpms are, so it's hard for anyone to guess. I suspect your WOT rpm numbers are at or below 5500, which is low if you are looking for good out of the hole performance.
I have a Yamaha SWS II 15.5X15" prop you can try if you would like. It's basically one size down in pitch from what you have, which I'm guessing is the direction you need to go.
23' Seahawk "Midnight Sun"