I have experimenting with changing the Femonauts uniform to use normal shoulders, while still leaving the rest as is. I have it at the same location, if anyone want to try it out.
It might fix the thin neck thing, but I haven't tested it extensively. I have only tested it with my edited faces.
I think I prefer the original femonauts uniform personally. My edit seems a bit disproportionate or something. Well it's there if someone prefers it.