How to reduce motor vibrations?

[MarkMan0]

Hi!

I'm running Marlin 2.0.x, but figured I would get more help here. I'm running "bigger" Nema17 motors, parameters down below. At low speeds I can feel low frequency vibrations(I'd guess a few hundred Hz) coming from the rotor, and at normal speeds, the motors are quite noisy, and the whole frame is vibrating. Only spreadcycle is used, no stealthchop.

Tried to calibrate the chopper hysteresis using the example here, to no success. I needed to increase(using - button) the hysteresis to it's maximum value, while Toff was 2-3-4-5.

What would you recommend I change? Will modify marlin, so I can change all the registers while printing, are there any registers I shouldn't change while the drivers are enabled?

Motor running at 900mA.

This is the motor
And the parameters:

• Voltage: 4.0 V
• Resistance: 2.0 Ohms
• Inductance: 3.3 mH
• Rated Current: 2.0 A

[MarkMan0]

So it looks like it's not vibrations, but low microstepping accuracy. I've got vertical lines on both x and y. Any suggestions?