• Dropouts are parallel.
    Tune hub.
    SRAM single piece sprocket, with the two smallest floating. It doesn't seem to happen on the two smallest sprockets.
    Chain slack seems to happen only with this set up, and wasn't due to a change in gear but just a slight backpedal.
    Spokes are solid.
    Thanks for the help, keep the ideas coming.
    I'm beginning to think it might require a new free hub?

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