Hey Jonathan @3DTitties ,
That doesn’t sound right!
The Clamp Factor doesn’t do anything, when the Factor is in the [0, 1] range (so that includes 0 and 1!).
When the Factor is set to 5, for instance, then with Clamp Factor on, it will use a Factor of 1 and when Clamp Factor is off, then it will use a Factor of 5.
(…and I think the MixRGB, clamped the Factor automatically…at least it did that in 2.79..)