Simple - one week one, one week off. The parent who has the 'week off' has first right of refusal. Of course one time or another one or both of you might have to offer a day or two of flexibility but it shouldn't happen often.
And John, please listen or quote accurately. We did not tell you to get an attny to just "have her served". We suggested you get an attny because your W has total control over you and can manipulate you into anything. Sort of like she did just now. Now that SHE needs a schedule for HER job she is willing to talk to you in a productive manner. Until she needed something from you she has basically told you to go to hell (peppered with a few ILY's and kisses and sex for getting to leave Retro).
There is no reason to tell a wayward spouse what your legal plans are. It's none of their business or concern. If they wanted to make decisions together they should have remained married and that perk would remain available.
The one talk alone where she dictated that you would be paying her support for double the amount of time you were married (or suggested such) should have told you to get an attny ASAP.
The dynamic between you has not changed at all. Since the problem is still present what will you do when she starts her crap tonight? All I know is the first thing tomorrow you better get that schedule IN WRITING and signed properly to make it legally binding. Please don't keep making the same mistakes.