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Chain length is a good shout. At a push I could remove a set of links. Might make a difference at the high end as the range is so huge it does look pretty slack on the smallest.
Clutch is fine, and I was worried about it being wheel slip so slammed it all the way back to guarantee centering it for a ride earlier and it had no effect.
I guess based on your last point that it could also be a bent derailleur or hanger. Not sure how to test for that specifically other than a hanger alignment tool.
Chain length?
Clutch worn out?
Rear wheel slip, off center or in wrong position for hanger?