GH1 Hacked GH1 - best camera setting for talking head?

I'm shooting a series of talking heads for a documentary, shooting 1920x1080 AVCHD files on a Hacked Lumix GH1. I've been using the (RED) Auto setting. The lighting is chiaroscuro using single source soft box light against a solid black background. I'm seeing some VERTICAL RAINBOW STRIPING on the darker side of the faces. How can I get rid this? Is it the camera? Is it the Hack? Is there another camera setting that would be better for this? I'm still testing the camera out.
talking head.jpg
 
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