Hmmm... let's see, how much water are you drinking? Are you constipated? Are you counting all carbs (like in the cheese)?
I'm leaning toward more water... fix any constipation you may be dealing with... cut back on the cheese... more veggies (are you going by the old "cup" rule or do you have the updated food list?) as possible solutions. I also believe your long history of yo-yo dieting is going to work against you. It won't make it impossible to lose, but it will make it more difficult. Chances are good that unless you were also exercising during these diets that you've lost muscle. When a person loses weight without maintaining an exercise routine that person will lose a higher percentage of lean tissue to fat than a person who works out. BUT, when that person regains the weight he/she regains JUST FAT. So the person ends up fatter (ratio of fat to lean) than when they started... even at the SAME WEIGHT. Do that a few times and you can understand how bad that might be for you. Lean tissue is metabolically more active than fat... it uses more energy at rest. So the leaner you are, the more you can eat to maintain your weight. The fatter you are (again, % wise) the less you can eat without gaining. Your caloric range of 1600 - 2000 MAY be too high for you. Atkins recommends 1500 - 1800 for women. Try cutting back to 1500, no more, for a week and see what happens. You can do that by cutting out one of your protein choices at each meal. Meat, eggs, cheese... pick one and ditch it. I would suggest you drop the cheese at one of your meals, if not both. The meat and eggs are a better source of amino acids (protein). Use cheese as an occasional garnish or treat. If you're being very liberal with added fats... measure those and be sure you're not under estimating your serving sizes.
Hope this helps point you in a possible direction!
Also... the ketone strips are pretty useless for weight loss. The only tell you if there are ketones in your urine. There's no connection between how much weight you are losing and the color change. Excess ketones are expelled through urination and exhallation... and not evenly so you really don't learn much from the strips. A trace reading just means you had less ketones there that time. Eat a meal high in fat and then pee... you'll have a darker reading. Don't drink enough water and you'll concentrate the ketones... higher reading. Drink lots of water (like you should be doing) and the strip may not change at all. So... they really don't mean much. LOL If you have any color change you can safely assume that you have entered ketosis.... but no color change doesn't mean you haven't.
Let us know what you change and how you make out!
I am the master of my fate:
I am the captain of my soul.