If anyone cares to fool around with this sample scene file:
http://cid-b233dcaeefa9709c.skydrive.live.com/self.aspx/Public/Poser8%20samples/Simple%20GI%20Test.zip

Maybe you can get better results.  Constraints:

• No lights with shadows disabled allowed, although you may add additional lights if you feel you must
• No IBL lights allowed, period
• Fill lights are strongly discouraged
• Minimum # of bounces allowed is 3, so that all surfaces "technically" should catch some indirect light
• No deleting any geometry in the scene (there is a 10x10x10 box around the scene, to serve as a "room" environment).

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