I don't think the weight difference is enough to be concerned with. The Strada bearings obviously served Paramount track riders well, a lot of races and championships were certainly won using them. As has been pointed out before, Paramount track bikes came from the factory with Strada headsets and I'm positive the overwhelming amount of Paramount racers did not swap them out. Plus maybe they even preferred the "Campagnolo" readily visible on the top nut over the plain one on the Pista.
Tom Sanders
Lansing, MI USA