prop survey

[76GMC1500]

I've got a 260hp Volvo I/O 280T with a Michigan 15x19 3 blade aluminum prop. *I feel my numbers could really be improved with a better prop, but I'm having trouble getting numbers for it. *I don't even know what my WOT rpm is. *The highest I've ever taken it was 4000 rpm, the book states 4400 for WOT, but it seems like I have a lot more to give it. *The trouble is, I hardly ever get any flat water here and the boat is coming completely out of the water by 4000. *My cruise is only 28 mph at 3200 rpm and 2500 rpm only gets me 12 mph. *I would like something that holds on to the water a little better at 2500 and would help pick up my cruise some. *I could care less about the top end, I've got no use for that. *I was looking at a 14 3/8ths x 19 4 blade stainless. *There may be a 330-350 hp engine in this boat's future as well (fuel efficiency reasons). *Don't worry about overpowering the hull, the motor will be derated from a 5500 rpm redline to 4500 which should keep me within the 310 horsepower rating for my hull. These numbers are with full gas, gear, and 2 POB.