I replaced my motor a few years ago and just recently re-setup the motor. I put replaced with a 23P Tempest on when the boat was at 6" PTP. I raised it to the highest position on the transom and am at about 4". The boat gets out of the hole very well but i am only turning about 5K RPM. I am getting to about 53MPH. The prop has large plugs (holes). I noticed that I can trim up all the way and the boat slows down about 3 to 4 MPH and i do lose some water pressure. It appears on my gauge to be about 20PSI when i am hooked up just below full "up" position.