I have an FX1 which is close in size to your camera and I use this and LOVE it.
http://www.bhphotovideo.com/c/product/98762-REG/Video_Innovators_106_S_800_...
I removed the front handle and just keep right hand in the camera hand strap on the controls and place my left hand up near the lens. To hands plus your shoulder gives you 3 points of contact and makes the camera much more stable.
And because you have 2 cameras you should have one stationary on a tripod that will give you basic coverage that you can cut to when needed, like if you need to move with the mobile camera. Your stationary camera on the tripod is also the camera that you feed the audio from the sound system into because you dont want a cord running to the mobile camera.
Hope this helps.
There are no "technical solutions" to your "artistic problems".
Don't let technology get in the way of your creativity!
