Troy Byrd asks: Question for you guys. Running a 13 1/2 x 15 stock Yamaha prop on my 90hp Yamaha and I’m only getting 4100rpms at wot. It’s on a 16′ ski barge, I use it to wakeskate too and it bogs down real bad pulling anyone out that weighs over 150lbs. Any ideas on what I should be running? The picture is with the old 55 evinrude, just wanted to give an idea of the hull.