I have an A2000 with a TEAC 5.25" PC configured drive that I intended on using as an Amiga drive, so this topic would be relevant for me however I have not made it far enough to actually try it out yet (I need to fix the A2000 first).
Just checking to make sure.. Are you using a proper Amiga-twisted floppy cable and not one designed for a PC?
This is how it should be twisted for the Amiga: