I still think the bed issue is a big one, if you were to sleep (not sex)together it would regain some of the intimacy which I think is a huge part of it.
How does he feel about you BFing apart from not wanting to watch? Does he agree with your views on it apart from being around when you do it or does he think you should stop?
If he supports you in it but can't bring himself to be around then it's one issue (him not liking to see), but if he doesn't support it at all it's a different issue iyswim.
Do you do anything together? without Elliot? (not saying this is because of him at all, but you need to focus on your relationship as a couple rather than as parents).
Lastly, can do friday or weds this week, and I'd come to you as the kids are desperate to go on a train if you want?