Document and keep track of when you have kids in a spreadsheet or calendar online. Make you have a color and ex have a color. Then once a year goes by, put it all one one sheet small color coordinated and add the days for each at bottom. Keep emails/ texts for each switch she asks for. Just send her an email after you talk "this is to confirm that I will be picking up kids on saturday xx date and keeping them to xx date.
I would just keep documenting for a while longer. Let the kids get older (how old are they now?). Go to their activities, take pictures with time stamps, take the to dr appts and dentist appt each year and have the dr write that you brought them on their chart and ask for a note on prescription pad that "xx (you) brought child xx to this dr office on xx as child was sick" something like that (you can say it is for your job.
If this is about
child support, then only fill out that paperwork for modification for child support. The reason "father has had children for xx days the past two years and father would like for child support to represent the actual time the children are with each parent. The child support was set xx years ago, when the father had children xx days per year and the new xx days has been in agreement and working since xx date."
Really, have you tried to talk or email your ex about all of this. If it is about getting the visitation on paper only, ask her "since we have had this schedule since xx and it has been working, could we both sign paperwork stating this new visitation schedule we have been using the past xx months? It will not cost you anything and we will sign a paper in front of a notary and put it in with the courts.
or if it does have to do with money,
ex,
As you know when child support was first calculated it was when i was seeing the kids xx days a month. I am now seeing kids xx days a month and have to feed/clothes/ and meet their basic needs on my parenting days. I would like to discuss a partial decrease in child support to help with these costs. We will always split the big things, school trips, activities, and out of pocket expenses but the weekly child support needs to reflect how often the kids are in each house, sleeping and eating. Then get into what you propose?
YOu
If you are court ordered now, you can not just come up with another number and switch it so it would have to go to court anyway but maybe you can be on the same page.
Bottom line is what is important to you. Can you survive paying the child support and being able to see kids? If yes, leave it alone for now...If you really need the money, ask for her to send clothes, bathroom supplies with them since she has the child support money. You must go to court to deal with the child support. If you file for that, then she will either pull visitation from you and file a counter motion or you go to child support court and prove your case. (with the calendars and pictures of when you had children the last year...).