Please don't beat yourself up. This could unfortunately be your fault but at the same time, there are many people that this has happened to that haven't done anything wrong.
It was my understanding that for pouch dilation they removed *all* the fluid for a period of time (like a month or longer?) and slowly and gradually start filling it again. Personally, I think it seems strange that they replaced some of the saline only after a couple of weeks even though your pouch is clearly still dilated?
Lastly, I've heard (not sure if this is true) that once someone has issues with a dilated pouch that it's always somewhat of a problem. I know for myself, my insurance will cover revisions to another band, sleeve, DS or RNY if my doctors can show that there has been some sort of "uncorrectable" issue (such as pouch dilation). You might want to ask your doctor or see what your insurance says about what the potential next step could be.
Hopefully a total unfill will resolve your acid reflux and let your esophagus rest and shrink back down.
Good luck and hang in there!