Wow! That is an unusual type of bomb. Glad the session helped prepare you.
I also wouldn't say I get much response from H about greeting him at the moment when I do it...but notice that it seems to improve his mood for later on in the night. Although don't ask me about tonight - did a ton of things right but one little conflict might have ruined all that prep work. Have you read or listened to the Ellen Kreidman books yet? Some of what she recommends is hard to do with a separation but a lot of what she goes over is still applicable. It's all DB compatible and I found it helped give me a better idea of what specific changes I needed to make in my treatment of H.
In some ways your H's mlc sounds a lot like mine. I hope your session advice will be helpful in dealing with him!