Do you realize that many people on this site implemented NC or low-contact (is that a reconized term?) for months while sharing a home with a WAS? You do not live with your ex and you do not have young children so you have an advantage already. You are addicted to interacting with her even if it is negative interaction. You feed off the analysis of her behaviour and motives because you think it will provide answers. You fear limited contact because it means for the first time in a long time she will not be there. Even if she spews rage at you at least you are getting something from her, right?
Your wife needs counseling. You need to take your medicine....right now you're saying "I know that if I took this medicine it would work, but it sure tastes awful". It tastes awful (at first) but it WORKS.