I was out in my 21 xti wakesetter on the weekend, and we had the boat loaded up with seven adults and a few kids, and the wakeboard wake was great, naturally, but I really noticed the extra weight getting onto plane. Its the 310 carb Indmar motor, and have no problems with it, but I've heard that changing the prop is one of the biggest performance mods one can do. The standard prop is the ACME 515, and certainly when the boat isn't loaded it is more than fine. Pulling a heavy skier out or getting onto the plane loaded up takes a fair bit more throttle of course. What I'm asking is, what are my options, (I've read the 525 is a common replacement) however what difference would a 4 blade make? I don't want the ski wake to suffer, and top end doesn't really matter in a towboat in my opinion. Currently the boat sits on about 3200 rpm at 32-33 mph. I've heard some props can reduce the rooster tail. I ski at 15 off, any closer you're right in the tail which is hard to cross (at my level). Has anyone had any experience with this boat and different props?