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Claw, I think that's an excellent choice - certainly the motor I would go with if I was repowering an Outrage 18! I do not think that is the correct prop for you, though - the recommended WOT range of that motor is 5300 to 6000, and for ocean use in particular I'd want to be toward the upper end of that. If what you mean by being more aggressive is going with a lower pitch, then you're on the right track. Of course the lower pitch will also improve responsiveness throughout the RPM range, and may let you hold a lower minimum planing speed - all good things in mixed conditions.

Regarding the porpoising, where do you have the motor mounted? If it is slammed all the way down on the transom (upper bolt in the topmost hole) then raising it will potentially improve the porpoising and likely improve performance overall.

Tim