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Hi Joe,
It's the instructions from the Honda maintenance guide that I was referring to. I'm traveling so I don't have them on hand, but speaking off the top of my head they went something like this; Measure 20" from the keel to the top of the engine's transom mount. They may have assumed the transom would be 90 degrees to the keel. I did not do the geometry calcs to figure out why but on a Dauntless 15 the anti-vent plate ends up underwater 7/8". I measured and took some decent pics before I moved the engine. If you like I could do a project album on raising the engine and post my observations. It was simpler than I thought using tips I gained here. I went up two notches and the the anti-vent plate is now 5/8" above the keel. All this is in prep to go to an SS prop this summer. I'm moving one step at a time to see what each change does for me.
I agree with the water trial. Last year I had a lot of spray back from the lower end. Sometimes even over the transom. Only once was I able to really trim the motor out. In that case I was at max capacity (850lbs) and 500 of that was in the bow.