We have a winner thanks to my LBS (they diagnosed the problem within 3min of my arrival).
Cable routing was my problem. I routed the cable on the wrong side of the anchor bolt, so it was slightly offline. I flipped the anchor plate 180 when I cleaned up the rear derailleur. The anchor plate has a cable groove so I routed to the cable groove side without questioning the anchor plate installation.
Live and learn.
Thanks again.
SEA
Originally Posted by SEAtrain
Problem Description:
Upon this morning's reflection, I realize that I don't have a good problems description. The derailluer is overshifting and completely skipping a cog as I shift to lower gears. This happens somewhere around gear 4-6. I think I still need to define the problem better.
Cable Routing:
I know that the cable moves smoothly through the housing. I pushed it out of the shifter's cable anchor and moved the cable back and forth. The cable moves very smoothly. In fact, I routed the cable housing through the shifter's inboard slot because the cable moves more smoothly as aposed to the outboard slot.