I hate to say it about someone that you chose to marry, but for a presumable well educated, intelligent man, your STBX is a dope. Make that a childish, entitled dope.
While it probably hurts to hear that he personally penned some of those painful things, the fact that he didn't use lawyers is kind of a boneheaded move in the circumstances.
We all read lots of stories about acrimonious "bitter" divorce cases - but the truth is I think most divorce lawyers who are knowledgeable about how the judges in their area behave, can give you a pretty good idea, and with some certainty, about where all of this will land. Listen to your lawyers an be guided about what they think will fly - and don't back down.
Really- I presume he's not looking for more time with the kids, right? So really - this comes down to money, right? (I'm ignoring whatever ridiculous clause he chose to put in about your personal behavior, which is probably unenforceable anyway). Your lawyers will probably have a very good idea about what a judge would decide on that score.