Thanks everyone for the great suggestions. Got home from work today and started getting my fingers greasy looking into it with your generously offered wisdom. As it turns out, when I removed the wheel and examined the cluster there was a small but noticeable amount of wiggle per Cyclofiend Jim's suggestion. The lockring was tight as could be so I'm thinking it's a loose free hub problem. I also want to check out Rene's suggestion of a misaligned derailleur hanger and Will's adjustment screw idea. Not sure if I will pursue repair of the 105 hub -- I think I'd rather put the $ into a new wheel that will last me a decade or two. Thinking about a White Industries MI5 hub and a Dyad rim. Let's talk, Jim Thill!
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