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.