Originally Posted by
Retro Grouch
Start over.
Disconnect both shift cables from their respective derailleurs. Pull up the Park tool website and start from the very beginning.
Once you get derailleurs well and truely screwed up, there is a tendency to make continued misadjustments in order to counter previous misadjustments. The solution is to start over fresh. The Park Tool website has well written step-by-step instructions.
+1
Instead of chasing this problem from the middle, disconnect the cable and start at your top most gear and try to get it right from there.