My Mondonico is upgraded with a modern Campy 10 drivetrain: Record 10 speed Al crank 53/39, 13/29 Centaur cassette, Veloce silver long-cage rear mech, and Veloce silver Ergo power levers. Front mech is a 2006 or so Chorus - no problems with it. All the parts were new or NOS except the Ergos. But the Ergos were disassembled and cleaned when I had a local shop attack the problem. They were not successful, but are just not that Campy-aware. I really think the levers are working correctly.
The problem is, I can't get the rear indexing to track all across the cassette, even with lengthy sessions of very small adjustments of the tension barrel. It's easy to get it to work right on the smaller 6 or 7 cogs, but it nearly always loses track on the three biggest ones.
A friend who solved this problem on his DeRosa modernization says the different levels and generations of Campy cassettes have different spacer thicknesses, in addition to different arrangements of cogs being joined together. So, presumably you can't just mix cassettes, Ergopowers, and perhaps rear derailleurs and maintain compatibility. He ended up installing a matched 2009 Centaur gruppo.
Is this apparent incompatibility a real problem, or do I really have something else going on? Are they all supposed to be interchangeable? If there are good combos and bad ones, what Ergo/cassette combos work correctly?