I recently purchased a boat like this. It has a Yamaha 150 with 13.75X17 painted stainless steel prop. I think this was the prop that came on the boat when new. I'm satisfied with the performance. With 40 gallons of gas and one person I see 5700 RPM at WOT and 42 MPH. I want to purchase a spare prop and thought I would try a different size. I'm interested in a Reliance stainless steel 13.75X19 or 14.25X17. What do you think?