/3/ - 3DCG

Hey guys, I have a question about uv.
Basically I have this bust in zbrush that I did. (like pic)
I'd like to UV it in zbrush for substance painter. Problem is that there is a visible seam near the neck area. If I auto unwrap it with zbrush and protect area, there is no visible seam but the uv island is huge, and the face area (where I want it to be the focus on) is super tiny, so the resolution is shit. I didn't retopo in maya, only duplicate and zremesh it.

The character is naked, so I have nothing to 'hide' the seam. What to do ? How to seperate the face and the neck without the seam being too visible ? I already created a skin material in painter, and the seperation is really visible. Not sure what to do, i suck at uv and don't really want to polypaint it. Is it something about UDIMS ?ty