Exercise will increase the levels of hunger. I gym 3-4 times a week, I swim 2-3 times a week and have also started to do my couch25k, this is in addition to about 45-75 mins of walking every day. I limit mine to 1100 cals a day, I do not increase my calorie intake to offset the calories used during exercise and my own provider doesn't advise us doing this either. It is about finding a balance and if you find it increases hunger, to increase the protein content of the diet, which if you're building muscle will burn calories more than body fat will.
As such, I've lost 7 stone in 6 months which I nowhere near would have done had I increased the levels of calories gained back by exercise. however, it is about finding what works for you, but exercise will increase hunger levels - I can assure you that you aren't eating a great deal. I consume quite considerable amounts of food especially until my recent fill, but I also completed changed what I eat, I don't do carbs. But my diet is very much protein based and if I find that Im hungry after exercise or need something extra to eat, it will always be protein rather than anything else.
It is hard to compare tho, what you eat or your losses compared to what others are doing, everyone burns differently, everyone eats differently, and everyone will find the place at which they lose weight . . .its a lot of trial and error.
Also just to say, I've had my band 6 months, and as yet it hasn't really suppressed my appetite at all, it really has come from strictly controlling what I eat, and basically what I choose to put in my mouth . . .