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The goal is for your WOT rpm to be at or near the upper limit of the operating range of the engine (6000 rpm; http://www.yamaha-motor.com/assets/se...2_1808.pdf) when you are running your lightest load. Since you are currently over-reving at WOT then you will need to pitch up. For every hole you raise the engine the WOT rpm should increase by ~ 200rpm or so. For every 1 degree you increase the pitch (for the same brand/model prop) the rpm will decrease by ~250rpm. Be sure to confirm the 6000rpm number via your engine owners manual.

The markings/numbers you are seeing on the prop might be a part number. Can you post it? Also, is the prop an OEM Yamaha prop?

Tom and others will be able to give you the best help with choosing a prop for your setup.