Try this...I shoot Nikon, so could not tell you what flashed to use, but if your Canon allows, try a hot shoe mounted flash with a high guide number as well as pre-positioning and mounting two other strobed along the walls of the track. If it is like Nikon, you can get some slave strobes pretty inexpensively. If you can get close enough to the slaves to trigger them with your shoe mounted flash, maybe you can adjust everything manually with some instant digital feedback in camera to help you out. Just a thought.....
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