Ok, i changed the subsurface scattering to .5, no difference.

I turn off subsurface scattering, no difference.

I increase the shadow blur radius to 4, and it softens the edges, but stil the eyes are very dark and bottom of the eyes show the same darkness.

I decrease the shadow itself down to .2. This fixes the eyes and brightens them, and lightens the bottom of the eyes. While this works, it makes the shadows in other areas too bright, and this would seem counter to having ray-traced shadows because the value is so low.

With depth-mapped shadows, i don't have this problem. I'm not sure what else to look at. Are ray-traced shadows really better than depth-mapped shadows? Because so far i'm seeing better effects of DMS on faces than ray-traced.