My boat is an 18' alum bayrunner with wood decking and center console, 2007 70 HP yamaha 2 stroke main, 8 HP yamaha four stroke kicker. Current prop is OEM aluminum 13.5x15, with a small bend at the end of one of the fins being the only defect. WOT is only 3200 (spec for motor is 5000-6000)...