I think you will be surprised at the mid-range performance improvement with the 4B Vortex prop. That extra blade will provide extra stern lift and blade area which should help you hang on plane at a lower speed, which is a significant benefit when you get into rough conditions.
I think I’d forget that existing tach and look for a good digital tach! You need an accurate WOT rpm reading with an existing prop so you have a good baseline before looking a stainless prop. In general, the SS prop blades are thinner than aluminum props, so they’ll spin a little faster than an aluminum prop with the same pitch and diameter. For example, the Michigan Apollo is the 4B SS version of the Vortex; the comparable Apollo to the 14 x 20P Vortex was 14 1/8” diameter x 20” pitch, so the thinner SS blades allowed them to increase the diameter by 1/8” for the same input horsepower.
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