Now, however, you do have an adjudication, and the court has give you greater timeshare, indicating that the court will entertain the idea that you might be the CP. At least the court wanted to prevent your X from using the CP status to later apply Burgess to a move case. Now you are the CP, you have a valid court order, and you should stick with it. At least for the first three months, don't alter it at all. Just get used to it. Some months from now, consider filing a request for Child support from your X, just to cement the fact that you are the CP. Don't do it right away, or the judge will get a bad taste. You want to show the judge that you are the better parent.
When all the hoopla dies down, you can consider allowing your X more time than the decree allows. But for right now, don't alter it at all; your X will be going out of her way to show that you can't handle the resonsibility. Let the situation mellow a bit, and see if your X is willing to work with you on an honest basis. If she is, then you can consider relinquishing your last 5% to make it even. If she is just posturing, then don't give it up. 5% is only about 8 hours a week, so if she wants an extra day, that's because she wants to have the greater timeshare. You just tell her that the judge made the decision, not you. REmind her that you tried to negotiate with her, and she refused. REmind her that you wanted to avoid the court, but she insisted on her move request, not you. Now the court made a decision she doesn't like? REmind her it's not your problem, but hers alone. You remind her that you agree with the judge and until there is a need to alter the schedule, you will just stick with it.
At some point in the future, if you can work together, then you can try right of first refusal, but only if she does it too. If she isn't honoring her words, and it really doens't sound like she knows how, then you can believe she is just posturing legally. If she honors her words, then maybe you can both concentrate on your kid, without relying on the court. But that will take time. Don't drop your guard, at least for another year.
You had a much better result than I could have guessed. You are lucky. You were prepared, and you were a bit lucky too. Now just enjoy the time with your kid, and be a fully responsible parent.
One more thing. The student repays his teacher poorly if he always remains a student. You have graduated now, and in your turn, you have to teach others, as I have helped teach you. Good Luck.