There is still something missing from H's perspective. He's not seeing it or getting it completely.
Are you willing to try MC as well as IC for a few months to see if it helps either of you? You could have all three Cs talk w/each other as long as you both sign releases allowing them to do so. Their joint consultations could be very useful for you both.
As I see it, and as you've told us, H doesn't get the quitting work/changing jobs thing. Can this be a major topic at MC? It is the one domino that must fall in order for H to have a chance and he's oblivious to it.
Maybe this is where FG is talking about your leading...but in this case, it would be to kick that domino over and start the whole thing going down.
I'm not sure how else to get it through to H, so maybe the 3rd party is the best route. Again, I'm not sure, but it may be worth the try - even if you've done this before. Maybe talk w/ MC and have them focus on this avenue.
Again, I don't know and I hope I make sense.
I hate to see you so frustrated and disappointed, especially when the two of you are so close to getting it right.