On the PrincipledBsdf, the driving factor for SSS is the Subsurface channel value; this is also known as scaling, either increasing or decreasing the translucency effect of the model's material.  The size of the model governs how high or low the value is needed to obtain that translucency, for Poser figures, you are looking at an approximate value between 0.01 to 0.05.  The higher you set that value, the waxier the skin appears like your image above.  I have misgivings about how the PhysicalSurface is set up for SSS, I assume that the scaling factor value for that node is internally set at 1, leaving it up to you to modulate SSS through the individual RGB settings to attain the 'right' look for your model.