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atz
hippy
What does it do at the ends of the cassette?
Have you used the adjustment mode and moved it fully the other direction to see if it changes/rubs? I've had it before that the hanger was bent and I'd overcompensated so much with microadjustment I was running it wholly in the other gear, next to the one it "thought" it was in.
If you really want to start from scratch then the service manual for your model on Shimano site.