I know nothing about the Nauticus smart tabs, so can't help you there. My experience with the Doel-fin is that it may well be the best bang for the buck there is, especially since it only costs about $30 and you can be install it yourself in a half hour. The only real potential drawback is you have to drill 4 - 1/4" holes in your cavitation plate. I could easily see not wanting to do that on a new motor, but on a 10-15 year old motor, that's not such a big deal.
What will it do? Get you on plane quicker, smooth out the ride, allow you to run on plane at a slower speed and reduce or eliminate porpoising are all potential benefits.
I originally bought one in the 1980s for a 13 foot whaler that porpoised badly and constantly in the chop running across the Chesapeake Bay. Put on the Doel-fin and that stopped instantly. Have since had some form of hyrdofoil on virtually every small outboard I've owned (30 years and 5 boats - 13 whaler, 17 wellcraft, 20 mako, 20 wellcraft, 15 logic). Now i use a slow troller because I get both the planing benefits of a traditional hydrofoil and the reduced trolling speeds when I want that.
Benefits vary according to hull style with the porpoising being very beneficial on flatter bottomed boats and the quicker plane/ability to run on plane at a slower speed more helpful on a v hull.
With your described issue, I'd use a Doel-fin or something similar in a heartbeat. but like I said, I know nothing about the Nauticus smart tabs, so can't offer any comparison there.
Also, keep in mind the right pitch prop can make a world of difference. Would be extremely helpful if you could find a way to have someone let you borrow a prop long enough to try out different pitches. or get advice from someone with the same boat/motor combination.