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Check your cassette spacers. Or sub in a wheel with a Campy cassette you know to be good and see if it the shifting improves.
Not too long ago, there was another forum member with a similar problem and the issue turned out to be on the cassette.
One or two of the spacers between the smallest cogs had burrs or molding flash that weren't cleaned up at the factory, and that led to incorrect spacing between those cogs. The difference between correct and bad spacing is tiny, so take a close look at those things.
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