Spent all morning so far with the Park Tool H + L screw and indexing 'How To' docs and upside down it shifts fine, sounds fine and looks fine. As soon as I jump on the pedals it's still making the noise/grinding.
As mentioned, the chain will only be an issue if it on the large sprockets but it's grinding on every cog.
Maybe as rusky said, SRAM X5 shifters and Mech isn't usable with Shimano XT cassette and hub.
Anybody else got anything to throw in??