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Jax -

Before messing with the prop, ensure the throttle linkage is properly set so that with the binnacle throttle all the way forward, the link in the engine is at the stop.

If you are 3 holes up, light load and only hitting 4600, you have the wrong prop.

Having had the exact setup myself, I say go with the Yamaha painted stainless steel or Stiletto. Not a fan of Solas. Remember blade design is different across brands, so an X by Y from Yamaha is not the same as an X by Y from Stiletto.

Yamaha and Stiletto Advantage props work well with Yamaha motors on classic 16 an and Montauk hulls.

With the engine 3 holes up, motor in tune and a good prop, you should see 42-43 mph @5500 rpm with full load of fuel, no gear and just you.