This is a new setup on an older bike: Campy 10 speed cassette, chain, RR derailleur (2011 Veloce), ergo lever (used, ebay), and Jagwire cables.
When in the mid range rear, either chainring, when shifting to larger cogs, there is a slight over shift due to the human operator on the shift lever action. In a perfectly smooth system, the overshift would self-correct and instantly drop into perfect alighment on the cog. In this case, the overshift sticks, and I have to pluck the cable like a voilin string for it to drop into place. There is no stickiness at all when shifting to smaller cogs.
I released the cable from the derraileur and evaluated if any kinks in cable action - there were none. Also, the derraileur itself moves smoothly in and out. This makes me think the shift lever is hanging up within the mechanism.
Does anybody have any insight?