Could be. Is it worse at one end of the cassette than the other?
If anything it's worse in the middle, then improves slightly in the lowest gears...
You're not mixing Shimano and Campy parts together are you ? I did, had just the symptoms you describe, and it drove me MAD(er).
@Scilly.Suffolk started
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Could be. Is it worse at one end of the cassette than the other?