Hi, the value 5.000000 for red is in my eyes a litle bit to high. With to high subsurface values you get an "wax effect" on your figure and high values are increasing the render time dramatic.

Those specular maps are often used in "DAZ world" to create " micro highlights by the skin reflection.

Since two years, i am not using "physicalSurface" any more. With "CycleSurface" i get much better reflections and have more control about the properties of the surfaces.