There is a direct correlation between Subscatter Radius and Subscatter scale, the higher the radius values, the lower the scale value.  However, if you push the Radius values too high, you get a white representation for Skin Subscatter.  I've tested these conditions using the Subscatter node, the PrincipledBsdf node, and the PhysicalSurface root node with pretty exacting results.  In the image below, I took the Subscatter Radius values and plugged them into a CombineRGB node that I routinely use for my Subscatter Radius.  The top set is from Ohki and the bottom set is from ghostship2, the left nodes are taken from their posted images, and the right nodes are modified by moving the decimal point over 1 digit to the left.  You can see that there is a major difference in how the color values are expressed as subscatter through the mesh.

Unfortunately, the PhysicalSurface root node has no way to modulate scaling, so I'm assuming that those calculations are handled by the node itself.  However, with the other available Superfly nodes, you need to tweak the Subscatter scaling if your radius values are too high or too low.  I suggest everyone check the Poser manual for the PrincipledBsdf and Subscatter and note the values they suggest for the different substances I posted above; all those values are based on a Subscatter Scaling of 1 which explains why their posted values are so low.