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Keeping in mind I’m a newbie with MPCNC’s and don’t have much experience:
Wild guesses/things to check for the x-axis:
Are the pulley’s secured properly on the motors?
Belt tension on both sides roughly equal?
If the belts are removed, does the rail slide smoothly? If not, perhaps some bearings are too tight on one side?
For the z… Make sure the coupler is tight.. Check the vref for the z driver? As I said, I increased mine to 1v. Mine sounded just like yours, I assume that’s “skipped steps”, but I don’t know for sure.