[Putershark]

I would check a few items then

• Let's make sure we are not dealing with a inner hull that is full of water and adding unneeded and unwanted weight. If so, easy enough to get it out by installing a drain to get it out and keep it out moving forward.
• As far as props go, I would install a Pro-Pulse model for testing (they have adjustable pitch) and as a good back up unit that will not rust. Also Mercury has a swap out program at some dealers that as long as you have not dented the prop, you can swap them out till you find out that works best for your set up. I am running a 3 bladed 17 pitch SS model, but my setup is not your typical "factory" at all...
• I would compare your present prop pitch and material to the ones that have been tested to work on the 190 hull by both Yamaha and Suzuki. Use that data as a base line to see how yours is working and the differences in both size and pitch as well as WOT readings.

Let us know how you make out