Thanks all. The Dura-ace wheels are wearing heavier 25c Michelin tires with sidewall protection and the Record wheels are shod with 23c Michelins without sidewall protection. When you spin up two wheels back to back and there's a significant diff in rotational weight, it's easy to tell which is lighter, and in this case, it's the Campy wheelset. I never had this concern with the Campy wheels when they were new, and I'm guessing it's the weight of what they've packed the bearings with. The Dura-ace wheel doesn't even roll back from its stopping point. I'll dig into them and have a look.
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Ron - Tucson, AZ