Is this any help? I wire up the Z steppers towards the end of the video.

https://www.youtube.com/watch?v=UQVooJ1aURM
About 25:40 time stamp

I started by trimming the motor wires as short as I dared as this last part is not shielded. I’ve not seen anyone run the shield right to the motor. May get a ground loop if the machine is also grounded ? Not sure.