H.A.
I was advised by my attorney to keep a detailed log. Every date that he is late. Phone calls when meetings are agreed on, times he shows up, leaves, etc. No emotions, just facts. If he no shows, shows up 5, 10, 15 minutes late - it shows a lot more if you have a persistent pattern and actual dates. I just kept a little spiral note pad and wrote everything down. I typed out the log that I had and turned it over to the courts.
They definitely do take that into consideration - they are trying to determine what is best for the kids. As to will it help you - I guess it depends what you're trying to get.