I have been averaging 1500 calories a day since late October. Today is my sixth week of being on plan and exercising and my scale showed me at 220.2 today (I won't change my ticker until I've seen that weight "stick," though), so my average loss is also two pounds a week.
You and I are a similar weight, though you (lucky!
) are a bit taller. While every body is different, your body could more than likely continue to lose at a good clip on more than 1200 calories a day. Giving yourself a few more calories, assuming you still lose on that amount, may be a good idea because you'll likely need to drop your caloric intake as you get closer to your goal weight; if you're already at a low level, there's just not much lower you can go without feeling blah.
It's easy to fall into the mindset of, "If lowering my calories makes me lose weight, then lowering
more means losing
more weight!" It's only true to a point, and past that point you really run up against diminishing returns. It becomes hard to fit all the nutrients you need into triple-digit calorie intake unless you're on a medically supervised plan. Your body also adjusts to the smaller rations and loses less as you slim down.
I do get what you're saying, though. I told myself I was going to aim for a weekly average of 1500 calories a day, but I hear warning sirens go off in my head whenever I eat over 1500 even if I'd eaten 1400 the day before and they'd just balance out for the week. At this point I have to make a conscious effort on some days to get close to my target instead of feeling virtuous for being under it.