What you are experiencing is called porpoising.
It can be caused by hull design or trim settings too low or too high. Usually too high.
But it can also be caused by having the center of gravity too far aft. Or in layman's terms, too much weight too far back.
Without the boat to test, one can only guess at what the problem with a particular boat might be. In the end no one would gain from such guessing.
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Democracy substitutes election by the incompetent many for appointment by the corrupt few.
George Bernard Shaw
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