That sounds pretty typical to me. Too much trim causes porpoising. You went to a shorter lighter boat with more power. This can mean that it is heavier aft. Each boat model is unique in its handling characteristics. I am guessing the Sea Ray was heavier in the bow. The '95 190 Horizon I had was worse than your hd220. At anything less than 30mph I could not trim without it porpoising. My 268 tolerates very little trim at normal cruise speeds of 26-28 mph. Unless I was trying to run top speed I could not trim more than maybe a few degrees. At top end I could trim to just about anything I wanted.
Several factors affect the ability to trim, including forward or aft weight distribution, hull design, and speed. You can trim more at higher speed because more of the hull is out of the water. At faster speeds the area of the hull touching the water (wetted surface) is further back, and the hull and propeller are shallower in the water. This means that the thrust from the propeller has less leverage or effect trying to lift the bow at higher speeds. Some people like to use a fin (like a Stingray, Edge, etc) on the drive. My experience with these was disappointing. For me and the boats I have experienced, these fins caused more handling problems than they helped. The require that you really stay on top of your trimming adjustments, and they can cause an excessive roll into a turn at full down trim. These were not characteristics I wanted, especially with other novice drivers.
_________________ Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.
Current boat: '02 FW 268 Vista Previous boat: '95 FW 190 Horizon
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