back sss try a redish or purple'ish color. the weght of the back SSS color is like the overall strength over the other SSS attributes[like epidermal etc]
the radius is like a fall off control, small is very sharp, big is very narrow and wide.
the depth is how much it will bounce the light before the light leaves the surface.

try a scale conversion of maybe 1 and fall off to 5.
start very small.