Something really jumped out at me that no one else has commented on. After the kids told mom they had Cheetos at 8am you tell us.
"She no longer has that right to dictate what I can and cannot do with them on my time."
I could not disagree with you more here and if you don't work on this these kids will run all over you and W in future years. Yes, she has no right to dictate to you. That said, kids need consistency and will play the two of you against one another like there is no tomorrow. You both really need to figure out how to parent together. Allowing the kids one set of rules while with you and another with mom just is not a good idea. The two of you need to discuss and agree on these things and then stick to it. If not it will be when you say no, they will go to mom. When mom says no they will go to you. Not good. She should not dictate to you nor you to her. You need to compromise and agree. FWIW Cheetos at 8 am is not the hill to die on. 8 pm maybe. Just admit it was not your best idea.
Then as Ginger and others are saying, I really don't get this custody thing. Are you saying you fought and paid to get primary custody and now want to give it up before it's even started? Dude, WTF? As the others have said, you need to step back and breathe. Don't undo what you just fought and worked to get. Why on earth would you do that? I'll stop here but, that scares me for you. Don't make any decisions until you get a clear head.
DonH Midwest Me 56 WAW-EXW 55 Met 11/95 / Married 5/00 Bomb 6/20/05 / She Filed on 6/2/06 / Divorced on 10/9/06 4 who'd qualify as GF since D & dated about 25 women since D