I currently have a 4 blade 21 pitch prop which is a merc marine revolution 4, this is the prop I have always used and it historically achieved great results, strong acceleration and a top end of over 50 knots. However this was before the longer shaft and jacking plate and extra weight.
I also have a new 4 blade s/s 24 pitch prop from Steel developments but I have never used it so have no idea what results it will give. Too much I think, the opti was only revving around 5400 with theb 21 pitch prop.
As I am sure you can tell I need help...Just floating around in a world of ill informed thoughts at thye moment...