Does trim change that much with attitude? If you simply point the boat up/down using the planes and forward speed, then I can only see trim changing due to temperature differentials or even minor variation of pressure due to the different depth of each end of the boat?
If the tanks are not totally flooded, then I can also see the shift in mass making a small change, but surely not that much? Once the boat levels it will be back in trim again?
I do agree that near/on the surface the boat needs to rock a lot more with the waves. It's almost completely immune to the sea state.
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