I also like the sound of your counselor. A pro-marriage one. Lo and behold they don't exist in my part of the world.

Points 1, 2, 3 - yup
Point 4 - it's one way to try to bust a divorce. At least it creates a positive environment for the child
Point 5 - it took my parents & their new wifes/husbands 25 years to become good friends post the divorce of my folks. Today we all celebrate together (birthdays, xmas), and they hang out. Up until reaching this point, they were amicable/civil.

As for when to file, it seeems there are no rules... What's your feeling now NM, after a few hours to digest?