I was out checking my boat after water pump install and have a question on trimming the motor. I have 3-5/8" prop to pad, 23 tempest Plus on an 150 Mercury w/5.5" JP, it reach 50 mph (GPS) at 5600. (48 MPH at 5400 RPM is about were I run it). Rooster tail a little above motor. I was playing around with the trim, and kept trimming it up and could tell it was getting on pad more and RPM was picking up, but water pressure was dropping. Are there a correct angle for the motor to be trim at?

It's a 87 ProCraft 1780V. I was told at a dealer that the boats were built to run with the Anti-ventilation plate level with the bottom of the boat at that, the motor would be around 5" below the pad.
I google this and been reading about boat set up, not sure what is correct, does the old boats set up different them the new boats?

A few years ago I had this boat at 3-1/4 PTP, at 6000 RPM, 55 MPH. (at 5800 RPM and 52 MPH the boat was easy to drive, cable steering). The motor was taken off and a part of the transom was repair, I think the jack plate was installed on different mounting holes, But isn't the prop to pad height measure the same regardless of mounting?


Thanks
Rick