(Poor English)
Try to bake a normal into ao or just treat your base as a diffuse.
And I think that if you just take NormalMap and Corss with [1,0,0](Assuming your hair texture is aligned along V direction, Or you just make it a parameter),Then drag the wire into Tangent and Tangent Output, with a value of scatter being about 0.08(Or parameter), you may get a better material.
This is the material with no hair shader but a normal map
And the picture below shows when you get no scatter input
Finally if you set the scatter to 0.08
