a hydraulic jack plate can be adjusted while driving your boat, even at full speed it requires a lil maintenance. a manual JP has to have the side bolts loosen before it can be adjusted. Did the previous owner have both plates on at the same time for a 12" setback? i'd call the basscat and see what they recommend, I would have also ran the boat see what the top speed was and then read the test speeds for your boat and motor to see if it is already getting maximum performance?
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