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When you mount an electric trolling motor on the transom of a boat, you need more thrust to maneuver with it. Strong tidal movements along the coast have a BIG effect on handling, and require a lot of power from the batteries. You will need MAXIMUM reserve battery capacity and MAXIMUM thrust to maneuver successfully against an outgoing tide in the flats with a boat the size of yours.

I would definitely hold off on purchasing anything LESS than 100 lbs thrust for a 25' Outrage transom-mount application. I would also hold off on anything less than a full-power 36 volt battery system, (3 batteries). You might get in a good cut with the tide going out only to find out you don't have enough power left when you need to get back OUT of the cut when you ABSOLUTELY have to :)
(I am thinking Cedar Lakes Bayou here :) ) In my youth, I had to spend a night in there in order to get out once :) If that ever happens, you can still fish the incoming tide waiting on the water, and the Oysters were delicious washed down with Jack and water :)