I agree, I think you just have too much light.

Based on what you described (with a few guesses on my part) I set up

25% white IBL
55% white main light (front, slightly above and right)
25% white fill light (front, level, from right)
25% white fill light (front, level, from left)
25% white back light (level, from left and behind)

Overall light intensity with such a setup will run from about 50% in shadows, to 125%. That's a lot of light, and very even. It will produce an over-exposed look with little contrast.

Here's my render with that setup.

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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)