Bagginsbill, you have given us some super good information here that will help us tremendously. Big thank you for your detailed responses.

But I can assure you that turning the GC down to 1.0 is significantly different than turning GC off. I have now done renders now with GC off, GC at 1.0 and GC at the default 2.4 or thereabouts. And the 1.0 is much richer than the default setting and it is not as rich/bright as turning GC off. And the preview screen looks way better with the CG turned down.