E - from my point of view, I think your H has read and digested the letter. He appears to be reacting to it. I think you are aware of this. His actions are saying he really doesn't want a D. I think you're concerned his changes right now are only temporary. If that's not the case, just call me crazy.
IMO, you may want to wait awhile before bringing up the letter.
What positive changes can you make to affect your H positively?
Would your H be amenable at all to MC?
What's your LL? What's your H's LL?
Please forgive me if I've asked you the questions above before or if you've already mentioned them.
