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Sorry for the delayed response. Finally got to break in my F70 and found some smooth enough water to get some performance numbers. Ultimately I went with Tedious choice of the Power Tech SCD3 13 X 16 prop with my decision to have the engine mounted 2 holes up. The cavitation plate looks to be roughly 1 inch or so above the bottom of the boat. The engine performs great for my all around use as I rarely am able to get it above 20-25 MPH or over 3000 RPM due to water conditions and in those conditions it cuts thru the chop easily. However, the full out performance is lacking. With 2 persons, safety equipment, and 96 pounds of fuel for a total of 551 pounds on the boat, WOT topped out at 30 MPH at 5000 RPM's. The range Yamaha states as optimum is 5300-6300 RPM, which to me is a pretty wide range. I would like to stay with the Power Tech brand of props as Dan's Discount Propeller very generously gave me a trade in period where I can pitch up or down for very little cost. My question would be, should I be looking maybe at a different blade diameter as well as pitching the prop down? I have seen the SCD3 in 13.25 diameter as well as the 13 I have. Also any other theories would be appreciated.