Porpoising = out of trim?
Can't say directly to your boat, but we often see/hear boats going by porpoising "Out of trim" is the immediate comment. Try putting the drive all the way down and using only trim tabs for minor adjustments especially side to side. There may be a "neutral drive trim position that isn't all the way down, but close. It should be easy to find, which is why I believe, usually all the way down. Otherwise , after lifting engine for trailer or shallow water, you and other owners would have difficulty finding a repeatable proper position. Recreational boats are not planned for that--should be easy and repeatable.
What did the dealer say? Owner's manual?
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