His R with the kids really isn't your R to manage. His living arrangements aren't really any of your business. Unless something has legal repercussions, leave him alone and stick to your legally enforceable agreement.
It seems STBX has a good idea: stick to texting. If you need to say more, send an email. Quit trying to control his life and his choices. They are HIS life and HIS choices and he has made clear that he does not want your input. MYOB.
As for his stuff, ignore it until the deadline for him to remove it. He has the settlement agreement, he should know when the deadline is. If his stuff isn't gone by the deadline, text him that it will go on Craigslist in 48 hours. Then if it isn't gone, post it on Craigslist as one lot for free or some low price, taker must take ALL at one time, and then you won't have to pay anyone to get the stuff out of the house.
In brief, as far as STBX goes: Stick to the legal agreement and MYOB.
As far as your kids go: do what you can for them within your APPROPRIATE sphere of influence. The support group is a great idea!
