shaking camera with letus

[pact2roll]

Hey, I'm trying to film a scene with alot of motion- steadicam tracking with a guy running. We're shooting ex1 with letus extreme, but have been encountering vignetting on the edges of the frame as the letus is shook back and forth from the camera motion. Has anyone tried cropping the vignette from the side of the frame and expanding the entire clip? Would this show an obvious degradation?

 

[pact2roll]

Also, screen grabs from the footage show an extreme amount of motion blur, would changing the shutter angle reduce some blur? What would be the best approach to minimize motion blur