What are your steps/mm? One possible explanation is that you are using 8-bit electronics and firmware that has to use double stepping to achieve 60mm/sec speed. Double stepping will mess up the microstep interpolation logic in the TMC drivers. AFAIR, Marlin switches to double stepping at steps rates around 10kHz, which would correspond to a speed of 50mm/sec if you have 200 steps/mm.
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