You are doing an excellent job. Let the lawyers handle things.
I am doing the same. My W has tried to instigate things between the two of us, but now that things are more formal regarding the lodging of papers etc, the best course is through our lawyers.
Man, I know where you are coming from. Divorce does suck.
The bad thing is I can see changes in her towards me, but with OM still in the picture, I can't see my sitch changing before our divorce is final.
Don't worry mate, it can't get any worse for you than divorce. So just look at an exciting and happy future for you and your girls. You will get through it and become so much stronger. Who knows what the future holds for you.