straight 8 vibration

was looking down carb while running and noticed more fuel coming from dispersal venturi in inner throat feeding middle cyls. than outer throat feeding outer cyls. have been through carb before. wondering if this is a known issue? and if different mixture in half eng would cause vibration?
 
Compare spark plugs from inner and outer cylinders. If there is a big fuel difference they should be a different color. Have you inspected your vibration damper? Be careful looking down the carburetor when engine is running. You could get a backfire in your face.
 
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