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If you feel that the boat is squatting at the stern when taking off, then fins might help. But fins are really a bandaid for a boat that isn't set up properly in the first place. I would be more inclined to install trim tabs, which will solve the problem and also help you out in other situations.

Also, you're not maxing out your WOT RPM so you can help by installing different props that get you right up to redline. You might want to get in touch with PowerTech props - they are very experienced with many boat and motor combos and you can describe your situation and get a recommendation (for free).