help Black dot on custom mesh, broken face model

[LionelShrike]

This bug alway happen with the face, other part like shirt, pant work fine. I following tutorial by tekken57 to create custom mesh.

To fix this problem i tried change mesh smooth to 0.1 - 0.7, if it still not working i try smooth, turbo smooth in 3D MAX 2016... sometime i got luckly after change parameter dozen times the head mesh don't have any issues or very least.

But most of the time the face model seem broken.  I tried rebuild face model, create fully custom yobj but the face still has some black dot. It has been week, i tried so many method but still don't understand why this happened, do you guy have any idea ? 

Software i'm using: x-rey, xpacker,3d max.

Video and files: https://drive.google.com/drive/folders/1O3rBN6c90ZyflEJacGqYYIKoTZ78ClOg?usp=sharing

Original Head obj file for testing: https://drive.google.com/drive/folders/0B-_gB33he87INndvNUp6TFZkZmM?usp=sharing