I see they allow all flights to 1500 feet but don't see where I can find any info on FAA COA/Waiver. I do see notes that flights over this altitude require approval by TF Green but it's not clear what that means in practice.
I'm split between going to St Albans, VT for the higher waiver or staying close and living with the lower ceiling (and less walking). St Albans is also looking windier than RI, which could mean even more walking with higher flights.