I didn't work too hard on this but what about something like this? The idea is to very SUBTLY suggest that if he was confident as a parent he wouldn't interpret a question as criticism...unless of course you actually meant it that way in which case you need to look in the mirror
"Thanks for clearing the air. I can understand why you would feel exasperated hen I nit pick over tiny differences.
For the record, I have noticed and appreciate the awesome job you have done as a father. I'm really grateful because D4 just adores you and nothing makes me happier than to know she feels loved by both her parents.
I am not her primary parent, we are both her co-parents. Not only does that give you the right to father her the way you want, you have demonstrated you are more than capable. Someday I hope we can talk about parenting together as equals without me being controlling or you being threatened. The way things are going I think we'll get there. Thank you."
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15