What shape is current prop, and what pitch and diameter? Do you have power trim? Does boat plane off fast or slow? Check your motor height, cavitation plate should be even or a little above the bottom of boat. Check your weight distribution, the more bow of the boat you can get out of the water the less drag, and better fuel economy. If all checks out I would go with more pitch on the prop to get the rpm's down and better fuel economy. Full throttle operating range is 4500-5500 and rated HP at 5000rpm.
There are still things worth dying for and 1 of those things is freedom.
I love Geese
Genesis 27:3 Now then, get your weapons, quiver and bow, go out in the fields and hunt some wild game for me.