I am going to disagree with this part of your post since I know many people (myself included) that DO have problems eating bread and rice or other food groups. That doesn't mean EVERYONE has that problem, but some of us do. I steer clear of bread products most of the time because it HURTS going down, and I am not even at full restriction yet. So yes, the band has stopped me from eating these things.
All in all, we do need to make better food choices and get in our exercise, but if we were good at any of that stuff, we wouldn't be having weight loss surgery, would we? Lindsay's post made it sound like the band really doesn't do much at all, and if that were the case we wouldn't all be shelling out thousands of dollars to get the band.
I need more fills but already have felt restriction on how much I can eat, which is the reason I got the band in the first place. If you can eat 1/3 of what you used to eat and be satisfied, then you are at a good spot, but if you are still eating more than that, I say you need to get another fill. I don't wait 6-8 weeks between fills because it isn't necessary. You can tell the restriction and the band has settled around 7-14 days after a fill. If you aren't getting the restriction you need, then why wait around another month or two? There really isn't any reason to. You got the band to lose weight, if you aren't losing weight because you don't have enough fill, then get another fill.