I would suggest a couple of things. For starters, most people take a few or more fills until they reach the green zone. Until then, you may have little to no restriction. That doesn't mean you can't or shouldn't do your part though. It isn't just about getting that restriction and eating smaller portions, you need to be adjusting your eating habits overall. Are you logging what you are eating and getting exercise? The band is only a tool and will not do it all without your help. My doctor and many other people's seem to feel 1000-1200 calories per day is ideal. If you are "eyeballing" it and not actually logging your food, you could be taking in way more calories than you should to lose weight. Also, are you getting in any exercise (walking, etc)? That will make a huge difference.
I have had 2 fills so far and have minimal restriction so I am using my own "want power" (thanks CG) and restricting my caloric intake. I started out sitting around, then walking and got up to 3 miles a few times a week. That too has helped jumpstart the scale moving again. I am averaging about 2 lbs per week, which is on track for the band.
For your own sake, act as if you have full restriction. Restrict your calories and make sure your meal portions do not exceed a cup in volume. I bet you will see some more results that way.
Good luck to you.