99.9% of the time it just doesn't work. Propping is very hard. and even when you find one that kina works you are still no faster (and alot of time SLOWER) than a regular bass motor, as well with a very sluggish hole-shot. The 2.5L series of motors from MErcury Racing were designed for HIGH PERFORMANCE LIGHTWEIGHT Boats. Your typical bassboat does NOT fall into this category. This is the Allison, Bullet, STV, Hydrostream, Stroker, Norriscraft type boats. Ideally, a motor swap for a 3.0L 200 will yeild the best results. Until then, a LOT of trial and error and most likely many trips to the prop shop. Hopefully it doesn't have the Sportmaster lower-unit (the sleek pointy one), does it have a 15 or 20" shaft? Is the boat balanced (Chinewalk). There are a lot of variables that will optimize what you have. At least you can get what you have running to its potential. Also, IMO 5800 rpm is lugging that motor and you are on borrowed time if you keep it up.

My .02

I'll measure the shaft tomorrow and let you know how it turns out after his work is complete. As far as chinewalk, the boat isn't too bad. Once I get I plane I trim until it starts and then back off a little and it rides pretty smooth. I did play with the jackplate a little before but ended up putting it back to it's original location. I am getting 11 PSI at WOT throttle. Thanks again for the help!