Yeah I think what you are doing is good. I would always just text about the kids and keep it at that. And that if the topic was important or about info I have not given in the past. for example "do we have tournament this weekend." reply, "see my email of April 3rd."
However, I must admit my sitch is very different now. I have absolutely no intention of ever taking her back. So I am not DBing for her anymore (I am doing it everywhere else to make myself a better person and have better relationships in the future).
I hope this helps out. Best of luck to you buddy.
Me 41 W 33 M 2013 Suspect A 11/15 Confirm A 1/16 She moved out 2/14/16 Stepson 13 Stepson 16