parenting coordinator

I know I'm not on here much between the munchkin and work...my divorce was final over a year ago.  My ex is extremely difficult to deal with (refuses to communicate unless he wants something, even with things that legally I'm required to get his input on, but he complains he is being marginalized, confrontational, etc).  I'm looking to make a few changes to our parenting agreement regarding some times, how a few things are worded to cut down on confusion, and modifying how the parenting time is laid out during the month for more routine and structure for our DS.  We are going to a parenting coordinator (mostly because he kept threatening to take me to the one appointed in our agreement because I wouldn't agree to time not laid out in our parenting plan so I contacted one).  Has anyone had any luck going to one to help with communication?