To answer your question you need to supply a lot more info to get a realy good answer. Your HP, your RPM, your MPH, and some dimentions ramp widths, is the leading edges forward or aft of the mounting plate and how much, dimention above or below keel, where the're aiming ( high middle low). and most important what you use your boat for. If you like rock climbing it's not so good.  If you cruise it almost doesn't matter.  If you race it's critical.  Take those dimentions and ask Greg Schoemaker over on Performance Boat or Tom here with Jet Boat Performance.  They have sooo much experience with other people's boats they will get you in the ball game.