Good thread, nice to see someone solved the noise mystery.
BTW, just as a reference, the Sedisport chain's flared inner plates I mentioned is pictured in the photo below...typical of the Sedisport 'narrow' chain.
And the 'Z' stamped chain should be a KMC. A KMC Z-70 gold chain ran with my 105 UG 7-spd cassette pretty quiet. Might consider it as an alternative.
(do post pics of your bike!)
