Gregg, what is the distance from your cavitation plate to the bottom of the hull? Another trick is to plug the top or top two water intake holes, and/or ream the bottom ones larger.
A water pressure gauge would be great. I could remove the existing trim tilt angle gauge, which I never use (the rearview mirror or the sound of the motor is better), and install a matching water pressure gauge.
I purchased a new 23" SRX prop, probably more effectively utilized on a raised motor than my current motor height. The purchase did not meet with too much resistance from Joy since I sold a 2-blade bronze prop two days ago and have two props for sale.