If your Four Winns has the correct propeller, it should not be porpoising. Chances are, the correct propeller was damaged and the previous owner replaced it with something that could he could get used or cheap.
Talk to a dealer about what you should have, either Winnisquam Marine, or Melvin Village. There are so many of those boats out there, it is hard to believe they would perform so poorly.
Or google it.
I am sure there is a solution that will not require trim tabs, and like the other contributors said, don't put on a the wing on. The wing is out of the water when you are planed off. It will have no effect.
Good Luck!
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