....?

I know there are variations for every hub / cog combination. Sheldons' Dictionary / Chainline will give you all sorts of figures for you to pour (pore?) over while you ter to find the problem.

I have Sugino RD in 3/32, Campy Record hub with 1/8 and the line is off by maybe 1-2mm, due, I believe, to the fact that there's a difference in spec between the components. The BB is "correct" according to all sources.

Frustrating, isn't it? On paper it's supposed to work. Indeed, it does, but imperfections are seen nonetheless.