I'm wondering what the "Tint" values for "Sheen" and "Specular" are meaning. Are they the "Hue" values determining the base color in the HSV color space?
Specular Tint colors the specular highlights (use at least some Roughness to see this, because the actual highlight doesn't change) with the Base Color.
Similarly (but quite subtle) with the Sheen Tint; it colors the Sheen with the Base color.
Both are for artistic reasons and not physically accurate.