Here's some food for thought. I currently have 2 Pure Aero VS, both uncustomized. They are currently strung with a Tecnifibre poly. One racket is SW328, the second racket is SW304. Keep in mind these are strung measurements.
It's most likely that he does have lead at 12 on his racket, not necessarily to increase the SW very high, but instead to at least match each of his racket to one another. So some rackets will have slightly more lead, some slightly less lead. It is much easier to add 2 in. of lead tape to match up the specs, than it is to manufacture the rackets all with the same exact specs.