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I had terrible judder on my front brake with a trp spyre and 160mm rotor. Copper grease on the back of the pads seems to have resolved that but I did also put new pads in at the same time... so could be either.
Pete4Eyes-
Copper grease won't have done anything.
I'd never put copper grease near my pads. If it gets onto the pad surface it'll ruin them.
I'd think your pads were worn unevenly. Putting in new pads solved that.It's possible @lemonade that your rotor is bent, check that carefully. If the pads are old they might be worn funny too.
I'd check the rotor, if that's dead straight then replace the pads with new ones. A bent rotor can be trued.Also, check your headset. If that's worn or not set up right, it could be causing the movement. IF you've a rear brake, using both at the same time will prevent movement. Try applying the front brake and pushing the bike forward and see if it moves/flexes.
skinny
Hmm, more research online and it looks like a lot of other people have had the same problem. TRP have put a video out that blames poorly faced brake mounts, but shows the pads hitting the spokes of the rotor as per @M_V
Things i will try in order:
QR even tighter, with lever on disc side
Copper grease on back of existing pads
New rotor
New pads