For what its worth. Our Makai has the general prop 15.5 x 16.5 at 500ish ft I've been very happy with it with 9-10 people. We'll have 12 this weekend, but I have no doubts it will handle it. Not sure it would plane out very fast full ballast and 12 people at wakeboard speeds but surfing no issues. But then again none of my crew is good enough on a wakeboard to handle that kind of wake anyways.