Having worked with some of the best band surgeons in Texas and witnessing many fills, I am wondering if possibly he miscommunicated to you that he didnt want you to have more fill "right now" and didnt mean not ever. When they do the fill under fluro, they are looking to see how narrow the flow of barium is. Maybe yours is where he thinks it should be for now. That doesnt mean if you lose more weight it would not change. Sometimes the docs just arent clear when they speak.
Also, from personal experience, I know that removing a small amount of Fluid and increasing your caloric intake can help boost your metabolism. My doc did this, unbeknownst to me, during a yearly EGD. Boy I was shocked when I lost down below my goal weight, thinking everything was the same as it always was. When he "confessed" that it was a little experiment to see if it really worked, I was surprised but pleased and relieved. I am in this for the long haul and hav always worried how the band could be managed for my lifetime. This makes perfect sense.
I also found out later, and had confirmed by a surgeon who is also banded, that if you remove all the fluid and leave it out (my case - 6 weeks) then start putting it back in, you will have more restriction on a lesser amount of fluid. Again reassuring me I can manage my weight for the rest of my life.
Hang in there!