Can I call him names? Tell you what I REALLY think? Hmmm... won't do any good.
My opinion - for what it is worth...
Keep him away from the boys. Don't ask him for ANYTHING - including his signature - even if it costs more/ takes longer. The further you are from him - the better.
The less I got from Chuck, the less I heard from him. When I asked for more (justified) he gave me grief. I'd rather not have the grief. I'm thinking it's the same with your Arse of an Ex.
Let sleeping dogs lie.
Might not be the advice you'd like but it is what I'd do. I'd keep my boys safe. Not let him know where I live. Because I know what it is like to live with an abuser and no matter what you do - YOU will always be the source of his anger. So the further you and your children are from him - the better. Because YOU get it. The courts don't always.