I have a 2006 Ranger Z20 with a Yamaha 225 hpdi with a Yamaha 25 p prop. At WOT I am turning 5600 to 5700 RPM's and 67 to 68 mph. This is with two people in the boat and tourney gear and two half to 3/4 tanks of gas. Is this what I should expect or should I be getting better performance? If so what can I do to improve this? Thanks guys for any and all advice.