You only have 3 meals with calories. This is part of your problem. Try increasing it to 6+ meals a day. You also need more fat in your diet, if you are doing to drop your carb intake that low. 20% bf is fairly lean for a woman. Getting it lower than that is going to require a great deal of effort. Seriously, at this point a CKD might me a better choice if you have stopped seeing results on an SKD (such as Adkins).