I am a fill nurse and fill approximatly 20 patients a day at the surgeons office. We do our fills under flouroscopy each and every time. That gives us the ability to find the port without multiple tries and also do a barium swallow to adjust the fill as needed instead of "guessing" as to how much of a fill a patient needs. What size band do you have?
It sounds like you are too tight. When you are not able to eat you will not lose weight. Whatever you are able to keep down your body is holding onto because it thinks you are starving it so its going to hold on to all the weight you have.