I made a spread sheet of weights when when rebuilding my 23, it was very helpful. Basically take the centers of all you large components and their distance from a single point (outside transom face is a good place) then you can compare changes from the stock set up.
The stock live well (below decks) is already in about the same location as a in transom live well (its center maybe 18" forward of your proposed transom well). So you do not need a huge offsetting moment to compensate for moving the livewell back a little. BUT you still have to compensate for that motor and there are only a couple other things you can move (fuel,console, people, batteries)
Are there any other weights you can move forward to compensate? I moved my console forward by at least 6". When you move a console forward, you also move a lot of people weight too. I also moved my tanks forward.
I went with a large livewell/leaning post and I am very glad I did, her trim at rest is very flat and on plane I do not need trim tabs to keep the bow down. If you were running with a lot more HP, I would say keeping the CG back is not going to hurt you, but with a single 225 (I have a F225) I would get as much weight forward as possible. The faster you go the more aft you can have your CG
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