This discovery really helps, because now I have access to settings that can attenuate the effect. What I'm doing now is plugging an Edge_Blend node into the Alternate Diffuse for these materials. Results pending, but so far things are looking very promising.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3