Am I right in assuming that the green is what happens when you put in a loop?

If so I'd say to just play with the edges around where the extrusion goes up to the shoulder before/after adding the loop (I'd do it after, but if before works for you, have at it) until you get the result you want, shouldn't take all that long to get it right since it seems like a small area causing the issue

If you want you could upload a .ma of that part, then I could play with it and see if I can work it out

Thanks by the way