Originally Posted by
thnksfrtht
I'll then use the barrell adjuster to tighten until the chain jumps up a gear.
If I turn the barrell adjuster enough to spark the shift, it is often too much. My technique is to: 1) Turn barrell adjuster a click or two (or whatever), 2) reverse course a few cogs, 3) come at the shift again to see whether it works.
Have you put a hanger alignment gauge on the hanger to verify alignment? What you're experiencing seems pretty classic for a misaligned hanger.