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Well I took the boat out this past weekend and it seems the harmonic vibration is most noticiable from the hull at the port side of the reversible seat. It seems to come from that area. The tone changes when bouncing over waves so I'm pretty sure it's the hull making the vibration. I also moved the engine trim tab over halfway to the right but unless I trim it up so the boat porpoises, it still is very hard to turn left. Don't know what my next step is.