Sounds like he is eating and day sleeping like a champion. Have you tried a dreamfeed? Where you feed him late in the evening (without waking him) before he wakes up, say at 10.30pm? It might only prolong his sleeping for a couple of more hours but it may be a couple more for you which would be great! Aim to cut out one night waking at a time, its less pressure on you to get him to 'sleep through'. Maybe a cuddly might help? If he misses you and wants your company maybe a blanket or toy (wear it down you top for awhile so it smells like you!) might help him settle or self settle if he wakes?