Truthfully, I think at the weight you have listed, you should consume more than 1500 calories.

Atkins doesn't really give you percentages. I guess you could take your 20gr of carbs at 4 calories per gram, and subtract that from your 1500. (or divide it by it if you really want a percentage figure) Protein Power does have an opinion about protein. They feel that to save your existing lean body weight (read muscle) you should eat a certain amount of protein. They have this horribly long formula, but there's a shortcut. Take your current weight and divide it by 5.2. This is the minimum of protein per meal (figuring 3 meals a day) to protect your muscle. So, what you could do, is then subtract the grams of protein at 4 calories a gram,(times 3 for the whole day) from what's left after you subtract your carbs and there's your fat allocation.

I really think you should eat more than 1500 at your current weight. Good luck!

ETA: (and if anyone sees a mathmatical error, feel free to correct it )
291/5.2=55.96gr per meal, 223.84 cal per meal )671.52 calories from protein at a minimum per day. (45%)
20g*4=80 calories of carbohydrates per day at induction level. (5%)
Leaves roughly 83 grams of fat (748.48 cal) (50%)

Hope this helps!