Recently aquired a 20ft Storm bass boat with a 96 200 merc on the back. Motor was running poorly and found some chipped reeds to be the problem. Took the boat for a run and could turn 6200 rpms at 65mph and still had more to go. I have been told the max rpm on this motor is supposed to be 5600. The prop on it now is a quicksiler trophy 4 blade 14x26p. Do I need to go bigger and if so what prop should I try?? Also I had the jack plate buried all the way down!