I run C&V bikes with the following RD's: Campy Nuovo Record, Super Record, C-Record (1st gen), Mirage, and SunTour Superbe. By now I've found the best shifting and non-skipping characteristics with all of them to come with vintage SunTour Winner Pro freewheels and modern Shimano IG or HG series "6-7-8 speed" chains. I buy the freewheels new or nearly new on e-bay and, if one offends me, I'll clean it first and if it still skips I replace it. Likewise, I never wash a chain, just keep it oiled and replace it when it gets grubby. Life's too short to figure out why cogs skip. The Shimano chain on a good SunTour Winner freewheel really makes the old Campy RD a smoothie.