Hoo, boy, Karen, your H continues to act the part of the soulless git. He has never shown any real desire to honestly parent his children and yet he now wants to increase his time with them just to ease the CS costs to himself. And his words and deeds belie the fact that he has not suddenly turned over a new leaf either -- in fact, I bet he is probably worse than before the separation.
Here I am, trying to remain relevant in my own children's lives, going broke with the legal battles to do so, against a mother who has tried to scale back my children's time with me to boost her CS payment. She makes as much money now as I do, and yet I am on the hook to pay her a supplement. The chief difference is that I have a history of being a sole provider for my kids, being mother and father on weekends and evenings, whereas your H was not.
I am now part of a politically-active meetup group for shared parenting. I am meeting other parents (husbands and wives) who are fighting to establish that both parents are necessary for the proper healthy raising of children. But it's people like your H who have constantly given fathers a bad name. Nothing he does is motivated for the benefit of the children -- I am embarrassed and deeply offended by his behavior.