I had the same problem. Everything was perfect on the workstand, but couldn't ride the smallest rear cog without the chain slipping. I finally duplicated it by putting the wheel under load on my old turbotrainer - and there it appeared - Connex link slipping on the RD jockey wheels. It was a single Connex link, eliminated by replacing with a new Connex link. I've ridden a Connex link to failure on another bike - they do have a finite life, and the link slipping in the RD was the second-oldest I had in service.
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