Ditch the diff drop. It doesn't do anything to help.
Depends. If the baffles of your CV axles are touching after a lift it will keep them from excessively rubbing. The long term consequences of this are debatable. More likely you or a service guy will lose the spacers.
Some skid plates such as RCI's design have a profile with a "bulge" that allows diff drops
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Skid plate thread Consolidated 5th Gen Skid Plate Info Thread