i am no expert as I understand porpoising its because the motor is too angled up. on my triton hull the motor has to be completely all the way down I mean straight down to prevent this. trim it up a lil the boat goes to up and downing. When all the way down it dont. is it possible your mods changed the flow dynamics requiring the motor to be lowe?? Thats what my boat needed and solved the problem.
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