How was the bottom of the boat?? Clean and good running gear? A fouled bottom or gear will cost you a couple hundred rpm in a heartbeat. If everything was clean then I would suspect It to be overproped.
If overproped I would worry a little because that has probably been going on for a long time. I would have the engines checked out thoroughly ( but I would to that anyway, it saved me from spending $100k on my current boat).
If the bottom wasn't clean, have it cleaned and rerun it.
If overproped I would worry a little because that has probably been going on for a long time. I would have the engines checked out thoroughly ( but I would to that anyway, it saved me from spending $100k on my current boat).
If the bottom wasn't clean, have it cleaned and rerun it.


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