VSS will "fix" any skin texture within reason.  Some textures are just bad, i.e., baked in specular highlights. 

The standard practice with VSS, retain render Gc and adjust VSS gamma.  Keep in mind, VSS skin template gamma will only affect the material.  Render gamma is applied to every thing in the scene.  Otherwise, you would need to incorporate Gc into all your material of every single prop and character in the scene.  Better to use Gc in your render settings and simply adjust VSS to suit.