Thank you! Not sure how exactly I’m going to implement this (I don’t quite understand how shoulders even supposed to work, tbh), but it certainly something to look into.
Got a somewhat better shape of the scapula area by changing the “rest pose” so that shoulders now slightly hunched. Come to think of it, this pose seems more natural than a straight back and much more likely to occur anyway 
Rearranged the topogy and… well it looks broken in a different way now, but still a progress!
