Water drag is much worse than aero drag and you have both with the boat. I assume with just 30hp it doesn't come up on a plane but I could be wrong. If it does plane you want to get it on a plane and then back off some to save gas but maintain the plane. If it isn't planing but the hull is designed to you need more power to make it happen or lighten things up and hope. Make sure its operating in the motors designed range as well, if it over revs you need more pitch on the prop and if it never revs all the way you need less pitch.
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