Which of these are the best for my boat, or is another brand better? I'm running a Merc inline 6, 150HP motor on a 16' Avenger speedboat. Boat has a shallow V bottom, and a jackplate. Boat, motor and driver (and gear) weigh about 1300#. I get 58-6000RPM (54MPH)with an old, worn 19" pitch Merc SS prop and about 5200 (51MPH) with a good 21" pitch aluminum Merc prop. The WOT Max RPM difference between the two props is excessive. However neither of these props have the high-rake design. Also, I think I require more bowlift, since it runs pretty flat at high speed.