Hi Guys, I have a Carolina Skiff with a 15 hp Honda 4-stroke. My problem is when I take my wife and a cooler,my motor won't get up the rpms to get to plane. It sounds terrible. When I'm alone and empty out the boat,it's much better.I own 2 props, a 9 1/4x 9, and a 9 1/2x 8 5/8.It does run a...