You bought your boat from George, right? Didn't it have twin I/Os? How far apart were they?
That being said, the original spacing may or may not have been ideal. I think your thought process on the pros and cons of wide versus narrow is good. As you said, the boat heels a lot in a turn, and that may cause the outer prop to blow out in a sharp turn. On the other hand, with outboards you have the flexibility to adjust engine height to compensate.
The best guy to ask would probably be bilgerat. He's got the only 25 I've seen with twins on a bracket. If he doesn't respond here, you should consider sending him a PM.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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