If it makes you feel any better I am struggling with this same combination.
I now have tried it on a D4, and am not having problems, at least so far.
I've tuned, retuned, set back to zero. I go out and shoot people outside, sometimes they are perfect, othertimes they are back and front focused like crazy. I can't find any pattern -- doesn't seem to be just those shot with the left focus.
I need some more practice with the D4 to really eliminate technique as a problem. I am sure some of it is technique with that very thin DOF.
But I'm no longer convinced it is just technique. I am even starting to wonder if I have a bad 85, but I can't reproduce anything reliable enough to feel confident.
And oh by the way, my left side focus is about 2-3x as bad on the 85 as it is on a 14-24.
I'm thinking to get my D800 back and see if they can fine tune the left side, then see what it is like - if no better, and still good on the D4, then the 85 goes back.