@hborre The reference sheet you posted has the values that correspond exactly to the ones in the Poser documentation (except divided by 100, with a subsurface of 1.0, which should amount to the same thing). It's still useful since there is more information on it, but thought I would note that.

I am finding with those settings I still get areas where the SSS is making areas gray, especially where there are collisions (even self-collisions like a bent elbow) and around the fingernail beds. I know if I crank it up too high, those areas will glow red instead which also looks wrong. But that makes me wonder if maybe there is a better middle ground at a higher value. Ghostship2's values that are higher might be better in that regard.