Until BRP published the Optimum RPM ranges for the E-TEC 's, which is a much narrower range than the "Recommended Operating Range", the latter range is the only thing most dealers ever talked about! However the dealer I used for my old 115 had been selling outboards since the 1930's and seemed to be very knowledgeable. They insisted that the motor would be much happier and live longer if I propped it to turn 5500 (the top of the "Recommended Operating Range") with the max load, and that's what I'd do if had your motor. I believe Fr. Frank would say the same thing.
If they repitch your prop to 15" and rpm is too high with max load, a good shop should be able to add some cup in the tip that would bring rpm down and also add some stern lift. That would help lower your min planing speed which you will like because of how it improves the ride if you ever get into a rough chop.
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