I'm looking for opinions on what the expected performance should be with a 2009 350 MAG 300 HP. 1.5 gear ratio, 17P prop. I installed a complete SeaCore package into a Bayliner 2252 Hardtop (22.5 ft and approx 5000 lbs) a few years ago and have been underwhelmed by the performance and it seems that something is not right when I compare it to many other boats with similar size and power. Its max speed is about 44 MPH at 5100 RPM (target RPM is 5000-5200) and it gets about 2.2 - 2.3 MPG at best cruise ~30 MPH @ 3500 RPM. The hull is clean and I haven't found anything obvious. No one has a prop shaft dyno near here and I have asked two different Mercruiser Techs to look at it and they came up blank. This boat has a lot of frontal area with the hardtop but I still would expect about 50 MPH top speed and a much coarser prop than 17". Thoughts???