O.K. Looking for suggestions-boat is Chapp-19' Villan 5.7,Alpha 1,2100lbs,boat had a 19p alum on it when I got it,obviously wayyyy wrong prop, WOT was over 5600, now have a cleaver 21 WOT 5200-still a little high @ 58 mph, tried a 23p cupped SS-WOT 4800 @55 mph,lost more than I expected,rpm was...