You both sound like you're managing this well - when you do the conflict minimising stuff do they eventually find someone else to bother? Or is it still too early to tell?
I don't know if I'm managing things well. I'm trying, and there are still things that cause me pain. If they've found anyone else to bother, they're still going at it with me. It seems like most often it has to do with me sticking to the parenting plan when they don't want me to, or not agreeing with them on a parenting issue.
Before I respond to exH, I try to take time to reflect on my priorities, my values, and my boundaries. This usually helps me stay the course in a manner that I'm comfortable with. Every written correspondence I send, I make sure I would be comfortable if he shared it with someone else (e.g. judge, other adults who may or may not know me, etc.). My T has helped me reconsider things from a different light.
Following BIFF and other communication strategies has helped me clarify my priorities and act in a way I feel good about.
I used to think that my responses could lessen conflict from their end. E.g. - If I can only figure out how to email, speak, etc., then there won't be attacks, crazy, etc. It didn't appear to help. Sometimes I froze and didn't act. It could be that it works with some people, but I've found that in general, exH is driven by his needs. It seems to me that perhaps trying to manage his reactions by how I communicate/act was just a continuation of how it was when we were married.
What I try to keep in mind is that I can decide what I can change, what is non-negotiable for me, and how/if I want to respond. I too was so frustrated by his inept and sometimes dangerous parenting in the beginning, and so angry. It just continues and I can't do anything about it, so I have to change on my end. It's difficult.
I'm sorry to hear what your kids are going through. You and they are in an adjustment period right now. Does your daughter talk to you about her feelings? Can you let her teachers know that your family is going through this transition? The teachers might want to know if the glasses or other things get left at her dad's so they can contact him, rather than you. Also so they can work with your daughter on this.