If you couldn't lose weight before surgery, that's a big indicator that your problem is more of a metabolic one than an "I'm eating too much" one. That's why there are different procedures. None of them are universal approaches. If you eat 5,000 calories a day habitually, sure, restriction alone may work well for you. But if you were already leading a healthy lifestyle and dieting pre-op, that is a big big sign that your problem is your metabolism. In which case, restriction will help you lose a little weight (like you described above), but it's not going to work long term. I know I'll probably get flamed from someone for saying this, but the stats are there, the band has a high failure rate. Combine that with metabolic resistance and you're at even more of a disadvantage.
I know you're still early out, but have you considered a revision down the road in the event the lap band continues to fail you? (This is important to recognize that it is NOT your fault that the lap band isn't working as well as you'd hope. I think it's a matter of surgery mismatch.)
I was like you... I could NOT lose weight even as a pre-op eating 1200-1600 cals a day, exercising, seeing a nutritionist, personal trainer, endocrinologist, etc. I knew I was metabolically resistant and would need MALABSORPTION in order to put my body and metabolism on a somewhat level playing field to lose the weight. I had the duodenal switch (DS) a little over a year ago. Even though it's technically considered to be the most extreme of the bariatric procedures, I've lost at a slower pace than most. But I've lost almost 100 lbs and am only 15 lbs from goal. And I can eat. I HAVE to eat. I eat at least double what you listed you eat in a typical day. It's worth checking out.
www.dsfacts.com
Just something to consider a little farther down the road. In the meantime, I would try upping your protein. I don't think you're eating enough to fuel your body. Try adding some low carb Atkins bars and some more protein shakes to your daily intake and see if that helps you.