@operaguy - like how the skin detail has come out but I was assuming the micro displacement map would be the choice for the bump input, did this not work? BTW thanks for your earlier post, think reducing the spec levels in my render would help.

@bagginsbill - the idea of avoiding extra nodes is to keep compatibility with Substance painter which uses texture maps only . The thought behind adding a layer was to have the lower skin layers (pigment and SSS) set-up in the base layer whilst the detail and specular on layer 1 and blend the two together - in theory these could still be PBR mats compatible with Substance painter in terms of exporting/importing the textures . The 4% is/was the default setting used by substance painter, which I didn't question. Apprechiate the explanation and figures.