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In case it's of any help...

I have a 1992 Yamaha 150 engine, which I believe is essentially the same as yours (but mine is not the improved "Saltwater Series" version) with the 25" shaft and gearcase at 1.86. Mine is mounted on a 19 Outrage II, which is a heavier boat than yours. We are using a 4-blade stainless steel Mercury Offshore Series propeller (which I understand is now called the "Vensura" model), with 14 1/2" diameter and 17" pitch.

The engine revs up to 5400 rpm, the boat can reach 43/44 mph with a moderate load, and seems to be a good match for the engine/boat combination particularly in the mid-range speeds.