Really well done, OP, for making your statement.
It's going to be hard to stick to it, but it's the only option. For your children's sake.
Something is at the bottom of this.
It may just be that you have a wrong'un, a coercive controlling agressor personality who will always actively look for things to kick off about - even when you've obeyed all instructions and tried to get everything right, that's not the point. They want the psychodrama, the control performance. This will never, ever change, unless his health and strength fails, and that could be decades away.
It may be a symptom, of physical or mental illness - I've been around people with diabetes, bipolar disorder, brain tumour, and explosions can happen. In which case, maybe him seeking health checks could be part of your requirements.
It may be his own childhood playing out - do his own family have any insights? Time for a calm, frank adult to adult conversation face to face with them. Did this happen in his teens? Maybe with an ex? Living with an abusive parent can create abusive adults. But you know this, and you don't want that happening again via your own children.
This is bloody hard. Please keep strong and follow advice.