It wouldn't hurt to try increasing your calories, or maybe calorie cycling. Honestly, 1200-1550 sounds a bit low to me, especially with your running. I certainly wouldn't go as low as 1200, ever, at this weight. I'm currently losing on around 1800-2000 calories a day, and I don't get to run/walk as often as I'd like. Of course, I just started back on this about 3 weeks ago and I could be headed for a plateau anytime!
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