Somewhere deeper in that story, the one we never talked about, there was an assumption and agreement that their mom deserved and wanted more time with them. Inherent in the imbalanced divorce is the idea that the non-custodial (30%) parent wants less time with the kids.
In some twisted way, my ex-wife assumed that she was the better parent and thus more entitled to the child support, the house, and the kids' care and feeding. As a good dad, this was just her assumption. Today, her assumption wound probably be supported by state family law. But, I believe times are changing.