@DropOfffArtiste
"I wonder why she doesn't want you having more contact, if as you say, you get on well? Sounds like money isn't an issue and she can't relish shelling out for anti-social childcare."
I don't think she currently spends that much on childcare now, as she tends to use an elderly neighbour for the overnights, and uses another mum for some of the evening / early morning bits.
We get on fine, day to day, talking about the kid's latest antics, her telling me about some sport etc, but I can't raise the issue of time without conflict - so I avoid the topic.
My ex has previously said I'm an incompetent parent, but after the divorce my current wife saw how I was as a single dad and married me and had a son with me. I'm perfectly happy wrangling 3 kids on my own and various friends trust me with theirs.
I think my ex's problem may have been partly that she was controlling and because I didn't want confrontation then she thought I was incapable of making decisions. Then (after 13 years) when it finally came to something I cared about, we as a couple had no way to deal with the disagreement. She couldn't handle me not respecting her authority, and I knew no way to explain that "this thing does matter to me, and I have to say no".
Being charitable, as a loving parent she will always want more time with the kids and is worried that if she gives up time the because of her shifts she'll go for days without seeing them. There's some merit in that but it then does highlight a flaw in the system if just losing a couple of nights transforms me into the "non-resident parent"
Rasing children is hard - twins more so (for the first year at least), and in hindsight our marriage wasn't good. She had no ill intent but was abusive and controlling (learnt from her mother). When the marriage failed, lawyers were brought in and the relationship got worse. It was a long drawn out miserable time but is in the past and is mostly irrelevant.
Hopefully she's happier now and I certainly am, but the history and CMS's rules don't help coming to amicable agreements.
Again I'm not asking for pity - just saying the CMA's rules are unreasonable at times. I know it's a really hard problem to solve and that getting money to children who need it is a more critical issue than avoiding harm to families who share care.