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Jim, if you were not gaining more RPM when trimming out during your test run, then there's no additional speed gain to be had there. With the 16-pitch on my 15, I am a little underpropped (meaning too low a pitch) but I like it that way as it gives me the power to get good speed even when trimmed down in rough conditions. I don't know if you've spent time on a classic 15 but keeping it on the water can be a challenge! If I was looking for a full-on speed prop, I'd probably want to go up an inch or two, but the conditions when I could use it would be pretty rare.

Will Dan's let you swap more than once?

Tim