Try leaving Gamma at 2.2 and cutting your light intensity, or better yet, get rid of extra lights. You usually shouldn't need more than two plus an IBL (or just one infinite for an outdoor daylight scene).  If you use indirect lighting you don't need the IBL.

Also, if you leave Gamma at 2.2, run the ChangeGamma script under MaterialMods and set 'All of the above' to 1.0 to un-Gamma correct trans and bump maps...

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