Do you think the MC is pro-marriage? I don't have any experience with couples therapy, but I know the DB book and lots of forumers have pointed out that not all counselors will have a positive impact on the R, especially if they are more prone to wallowing in the old pains rather than helping find "solution-based" ways for the two of you to move forward and start making things better.
From some of the comments you say the MC has made, I'm not sure it is currently helping.
Me, WW - Upper 30s BD - Apr 1 2016 EA - Apr 7 2016 (discovered; ongoing for months; did not confront right away) Confronted wife about EA - May 17 Wife sent NC email to OM - July 11