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I think the drop will be more noticeable when the wheels are brought out more. The drop looks to be right on target. Just looks screwed up because of how the wheels are tucked in.
The wheels also look more tucked in because he's running about -3 degrees of camber (lower left picture of the second post gives you a good idea). I would first get a rear camber/toe kit to fix the camber before I put spacers on.