I also am a low BMI'er, I started at 190 pre-surgery and it has been 14 months since I have been banded. I have to be honest I stayed at 185 for about eight months. Reasons: tiny fills, a flipped port (more surgery), drinking alcohol heavily on the weekends, and eating junk food despite my continued exercise for the entire 14 months. I was frustrated with the band and felt like such a failure. Although I was happy with those who were losing weight, I had to stop coming to the site out of anger - mostly at myself. Especially because I have high blood pressure and diabetes. So six months ago I would've agreed with every word in your post and I even thought about getting the sleeve.
Things changed after I decided I was not going to let $8,000 be thrown down the drain. So again I reread the posts and decided to follow the plan to the letter.
The result was a 25 pound weight loss in six months (great for a low BMIer). Of course I stopped drinking, and finally reached my sweet spot at 7 cc in a 10cc band. Eating Protein with every meal was difficult as I used to be a heavy carbs eater but I stayed full a lot longer. I was convinced I could not lose weight but viewing the band as only a tool allowed me to use the other essential weight loss tools as well. The biggest tool for me is not eating after six o'clock unless it was a piece of fruit...I was hungry for about a week and then my body became used to eat.
Please give it another try...but have a plan that includes exercise. Believe me I am an emotional eater as well, but no weight loss surgery will work permanently unless we decide to change our destructive habits. Whatever you decide, I wish you the best of luck.