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I just sand-papered and isopropyl'd the fuck out of rotors and pads. It made a difference for sure but the back is still a bit squealy and braking feels meh after another bed-in.
It's only a 140mm rotor so I wonder if I could stick a 160mm on. I presume I could find an adapter to move the XTR caliper outwards.
There are various remedies like filing a leading edge on the pad like you used to on rim brakes (well, were supposed to but I never did) or to put grease on the back of the pad but I just find that some pads screech and some don't.
It's the luck of the draw.