I'm thinking that you may be trimming out too much when you 'trim for speed' - these hulls don't have a stern pad like some of the bass boats or Fountains so trimming out does not work the same. Also, do you have trim tabs? When I was a kid we had an Aquasport that porpoised - put fixed tabs on it with about 1 degree and it was fine (before hydraulic tabs were affordable)...
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