I think that with eating so few gm of carbs as you are, you are rather pushing the boundaries. On a weight loss version of low carb you'd be eating rather more carbs, possibly twice as much if you are losing weight.
For me, the whole reason for doing Atkins is because there are so few negatives, I feel great all the time, and although a few odd things happen when I go off track - like getting a reading of over 10 today after rushing off to the diabetes education session without having anything to eat - an enthusiastic liver, I assume, so I get better results when I eat than when I don't.