The 25 is very sensitive to center of gravity changes, both horizontal and vertical. Mine has a 5.7 duoprop with an aluminum platform and kicker. It balances well, but still likes more weight forward. Twins on a heavy stainless bracket put about a net 1000 lbs well behind the transom and several feet higher than an I/O.
Have you done the calculations to see how much the cg would change? Going to a single saves 350 lbs. Might be significant.
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