I'm pretty much in the same boat here. Was banded 01/15. I dropped about 10 pounds post-op right away but have struggled since. And I know it is tough to hear the "muscle weighs more than fat." Because just like you, I am working out and want the weight to come off even faster! So I understand. BUT it is true. You also need to make sure that you are eating enough. I stay at 1200 as my goal also. HOWEVER, If I burned 200 calories working out then I will eat 1400 that day. I use Free Calorie Counter, Diet & Exercise Journal | MyFitnessPal.com. It will log your food and you exercise. I noticed that when I was not allotting more calories for myself when I hit the gym that my weight loss stopped. Once I began eating more to make up for that, the weight came off again. You need to make sure you aren't putting yourself in starvation mode.
Also, have you had a fill yet?? I haven't, but am planning my first one for the beginning of April. I know it's a ways away but I'm self-pay so I need to save up for it!