In fact, after having read twice or thrice your last response, just to be sure that I got all details (lol) I've restarted from Ghosthip's thread on the skin, changed and corrected many details. Now, I will have to check with even lighter skin to be sure but to me that seems good enough:

Now, the SeparateRGB is again connected to the Subsurface Scale and to the Clearcoat inputs, without getting ghost effect, and the Radius values are (0.004820, 0.001690, 0.001090) which is what is on Poser's PrincipledBSDF node page.
I've unchecked the Legacy Scatter and I remark a slight difference on the nose: slightly more luminous, but that's subtil, so that I'm going to have more tests for this. Note that I haven't seen any difference in terms of speed. Unfortunately, Poser's Manual is silent on this point, the only thing we know is that it avoids SSS glow, but not if it's checked or not checked, so that I will see in the long run

Anyway, thank you so much for your help 

𝒫𝒽𝓎𝓁

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