Check the motor height first; anti cav plate should be above water when trimmed for running.
My buddy had a 25' Fountain with single 225 Optimax, that would porpoise like crazy in any seas above 6", yes 6".
We tried everything, raising/lowering the motor, four blade prop, moving the batteries forward, and adding a heavy anchor, chain, and rode forward.
Boat only rode well when the front fishbox was loaded with ice and fish, like a large swordfish.
The thing that finally worked the rest of the time was adding 200 lbs. of sandbags to the bow locker.
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