M542 driver - motor vibration at low speeds

[birchy]

More pictures and a video showing g1 codes at feed rates from 30 upto 2000...

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[JAZZCNC]

How have you wired them Parallel or Series.?

If wires are Ok Can you swap with another motor.? If it's so bad it's rocking the machine then I very much doubt it's a resonance problem has often resonance happens at Mid band not low down and just makes motors run slow and sound terrible. It won't rock the machine. Same goes for having wrong micro stepping set, it will cause poor performance and horrible sounding motors but won't make the thing jump around.!

Doubt it's Phase or miss-wire issue either because like John says it would stay with you across the range.?

This may sound obvious but you have checked the machine mechanically first before blaming motors.?