I am troubleshooting some issues with a machine I imported from China

The build quality is as expected...I am in the process of fixing it.

My latest issue is confirming that the machine settings for the stepper motors are correct...they don't seem to be "tuned" for the motors yet.

In particular, I get wavy lines at the beginning of the cut, which I'm sure is due to the acceleration speed. I modified them and saw some improvement, but I don't know what to set them to...

The stepper machine is:
https://www.oyostepper.com/goods-494-Nema-17-Bipolar-Stepper-Motor-12V-18deg-26Ncm-368ozin-04A-42x42x34mm-4-Wires.html

Any guidance would be greatly appreciated, thanks!