Nice looking boat man!. Do you want to run 7500??, average jet boats run 5500 to 6000!. I use Dyno and it's decent(BTW, what are the numbers at that RPM?), if you're power and torque is way up there then I'd say you have the wrong cam profile, you need a cam with a power range from 5500 to 6500 range. Right now you arn't making the power at that low of rpm. If it's real rich though,lean it out and see what happens before you dig into the pump, maybe it will come alive?. If you don't get much improvements though, I would think about changing the cam, go with high lift and low duration!. Just my worthless opinion!...