I hear you about shims Ferm, but I've had a good bit of experience with high powered skiffs. (We put 200's on out 19 footers, with a jackup plate, they could run through wet mud.)
Often times porpoising is just a trim issue though, a poorly angled transom often, especially in skiffs so that's one place shims will work.
One other thing, is there any weight in the front of the boat? Without some weight up there the only way to stop porpoising is to shove the bow down. The air under the bow will lift it & start the cycle. When my dog wasn't up front, I used to put all the gear I could up there.
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Doug
87 Cuddy with a 94 Black Max 200!
& a 1983 Cuddy, looking for power.
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