...AAAAAAAAnd solved. Guy on the Nexus figured out this problem. It's so out there, I would never have considered this one. Turns out that Vividian ENB does some stuffs with the nifs for children, which were overwriting the RS Children changes. I moved the ENB files WAY up in the load order (as in, before Distant Decal Fix) and had an instant fix. Consider this an FYI, and a full restoral of my endorsement for Step Extended for this mod. :)
Its not Vividian Per Se, it's the Subsurface Scattering Patch that does this which is an optional in the Vividian Installer. Moving it all the way up there you are missing out on other fixes. Simply move RS Children below Vividian and all is well.