I have a question for you. I have an xpress 90HP Yamaha, 2004 model. I have a 6" jack plate and am currently running a 13.25 x 19 pitch Hustler vented 3 blade prop. I can get about 5800 RPM max with two people and gear. I have always had problems with the boat porpoising when there are two people in the boat. The jack plate and the prop helped a good bit, but the boat still porpoises when it is trimed up. Strange thing though, is that if I am turning just a slight bit to the left, I can trim the boat to the max, and hit max speed and rpm with zero porpoising. As soon as I straighten the boat up, it will porpoise terribly. With just one person in the boat, I can trim it up to max and go left, right, or straight with zero porpoising. This has become a real pain in the .... for me b/c I typically fish with a partner. Please help, any advice would be greatly appreciated.