IN THEPAST 4 YEARS I HAVE GONE THROUGH 2 OF THE INBOARD PROPS ON MY VOLOVO STERN DRIVE DUOPROP .THE CONSENSUS IS CAVITATION, ALTHOUGH IT IS ONLY DETECTABLE IN ROUGH WATER. YOU CAN HEAR THE SPINNING AND RPM S ARE AFFECTED BRIEFLY. MY QUESTION IS WHEN I BOUGHT THE BOAT A 26 OSPREY IT CAME WITH AN...