Sinistre
I had the stock 9.25X10 3 blade. It's a good pulling and break in prop, but in my opinion it's not a fast prop. I keep it on board in the "go-bag" for rendering help in a tow or in case I found something unseen the hard way. Not working it hard, I've towed a 40' Cruise-A-Home at 5mph with it. Your Saturn is a soft bottom and wider than the norm which will handicap your top speed. If the engine is broke-in (it gets faster) and you haven't hit the rev limiter I'd say your engine is about at it's peak RPM which is where that engine makes power so going for more pitch is not the answer. I'd try the same pitch but with a more efficient Solas aluminum or stainless. The stainless will load up a bit more. With the best prop, trim and height you may gain another 2 or 3 mph in your application. You may need to raise the engine to get the cavitation plate at about even with the bottom of your hull, that is if the clamps don't get to high. If your transom is well built, you can have up to about an inch gap above the transom and bracket. I hate to tell you this but you MUST use the two mounting bolts that came with the engine, not just the two clamp screws in ANY case. If you cross a wake fast and hard, you can torque the engine right off the boat. I almost lost a 15 hp Evenrude that way, I was holding it just the tiller and going in circles!!! God I wish that was on video! That strange roster tail is anomaly comes and goes on mine from time to time as well. It's not weeds. It just seems to be how the water gets started flowing gear case - weird. I've found however it has no effect on speed.