Oh, looks like you're doing some tinkering. The light response is looking good on your new shader. I guess I better hold off on more experimenting. But since I already did these: A comparison of VSS and the default shader on the Stratus texture for Hiro. I increased the diffuse node value and the IBL intensity slightly. In this render, the intense light was too much for the hair, so I lowered its diffuse value to .6 and got this result. The other settings are the same as what's listed on the previous image.