Okay, small ring, small cog ... the chain is making contact w/ the ring next to it regardless of where the front derailleur is positioned. There's no adjustment I can make w/ the front derailleur to correct the problem other than adjusting the limit screw to act like an early warning system (so the chain rubs against that before making contact w/ one of the rings). If I do that, I'm still losing 3 out of my 9 gogs in the back. The small ring and smallest 3 gogs are affected by the angle of the chain intersecting with the big ring.