Just like anything, this is a tool. You don't understand the whole concept of it being a "tool" until you get banded. A lot of people go in to the surgery thinking the band is going to solve all their problems. This is DEFINITELY not the case. It takes hard work and extreme dedication. I'm not saying the other patients didn't have that, but I truly believe the band works if you are willing to do "the work". And its hard. Its a mind struggle a lot of the time and its frustrating at times. Dedication is the key!
Try eating more. Up it to 1365 and re-assess in a week to 2 weeks. No one here can tell you specifically what's going on. In most cases you're either undereating or overeating. With exercise I'd try 1365 or somewhere around there.