Interesting you find this on your bike. I think that each combination of gears may be optimized by a slightly different setup. I have a Campy front ring, and an EAI cog. My chainline is as good as I can get it without changing my BB to a Phil. It's about 1.5mm off. I put an Izumi V chain on and it makes the most horrible sounding racket I've ever heard on a bike. It's lubricated, and there are no tight links, but it pops occasionally (loudly) and generally sounds industrial. I put my Miche chain on, which has seen almost no miles, and it is quieter than my Campy Record drivetrain on either of my road bikes. Almost totally silent, even when I have it on a workstand at eye level.