I am new to this board but have been reading it for sometime trying to cure a problem with a porpoising(sp?)boat. I have an 86'Bayliner Trophy bass boat with a 85 hp Javelin motor. I have tried about everything that I have read on this forum to fix the problem. I have tried 3 different brand of hydrofoil fins, the Nauticus trim tabs, several different props, and a jackplate. Nothing has helped this boat. The jack plate is the only thing that really made a difference and it was for the worse. This leads me to think that the boat is too heavy at the rear??? I have tried adding about 250lbs to the front but that did not help. Does anyone have any ideas that I have not tried. My next option is to sell the boat.