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I can not answer your questions, but here is my 2 cents: I had a 21 Outrage and regret the day I sold it. I did not have experience with twins. Mine had a single 225. We would fish 60 miles offshore but always had a buddy boat or 2. I often wished I would had put twins on it. Got around 3MPG so had over 300 mile range.

So, Twins vs. single, I would think that would be answered by what type of boating/fishing do you do?

A lot offshore, redundancy and safety, twin 115 Yamahas and deal with the scuppers. Where is the water coming from? My scuppers at the transom were just a black rubber flap. Could you change out the back flow system?

No/little offshore, Single Yamaha 250.

Wish I could give you some weights and how low that made the boat sit in the water. Hopefully someone else can provide that info.

Good luck and great boat!