If you want anything other than the coloring oUF provides, you have to do it yourself in a PostUpdate or Override function. Based on your description:
I would like to have self.Health have a set color (yes, dark as everyone else :P) and have self.Health.bg have the .colorHealth, .colorSmooth (etc).
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The simplest way to achieve that would be to let oUF do its thing, and then just re-color the health bar (but not its background) yourself in your PostUpdate function.