I adjusted the zones on my IBL (it's a procedural so I can tweak the lighting nicely) and now I've got a good amount of "ambient" light, while still retaining a distinct lighting gradient that creates some shadow and contrast.

Notice now how little green there is - it's now "slightly" green.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)