As long as you keep your water pressure at 12-15 lbs. you are fine, and in the corners you will loose pressure, nature of the beast. Sounds like you need to try a different prop, but there are so many different varibles, including motor heights, load, weight distribution, props, and driver ability. Keep playing with the motor height, moving it up and down, and keep notes on heights, rpms, and speed and find some props to try.
08' 202 DC/ Yamaha 300 HDPI
Turbo Props Pro Staff