I think it looks SO much better in it's new pot.

He's right, all you can do is wait and see at this point. Unfortunately if it survives, it might be so severly stunted that the other may grow significantly larger in the next couple of years. Only time will tell. Just be careful not to overwater or underwater as this will make matters worse...sometimes less care is best for maples.

About the watering, that also depends allot of the soil, climate, and what it's been doing lately. Where are you located? i.e. I'm in Northwest Arkansas. For here, at this time, 2-3 inches a week would be way too much water, probable even for a red maple that likes water.

Totally extravagant bit of floof, that! Snowpea in Montreal