All the performance changes you've reported are exactly what I would expect from a good 4B prop. Being able to plane at 13 kts indicates boat is fairly well balanced. If the load you were carrying was about what you normally carry, I'd say you've found the right prop. If you normally run heavier, a 16 pitch prop would allow motor to rev a little higher. If it's an aluminum prop, a good shop could probably repitch it.
FYI, as I've posted on here before, if I were running an inboard or a 4-stroke outboard, the first thing I'd do would be add a gage to measure intake manifold vacuum. If you observe a minimum vacuum of 5-7" at cruise, your exhaust valves will live a lot longer! (The exhaust valve is the hottest and typically most life limiting part in any 4-stroke engine.) Basic requirement is for prop to reach max recommended rpm at WOT with normal load and still be within recommended range at max load, but beyond that, I think I'd be inclined to pick whatever prop gave me the max speed at about 7" vacuum, provided that min planing speed was acceptable and it didn't ventilate in hard turns!
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