What kind of machine is this that you are running on? Is there any chance of "slip-stick" happening on the guide rails? Since you mention that it works well in Zlevel arcs, that makes the guides a little suspect, IMO. With the motors off, can you move all the slides freely?
As far as shielding the power conductors, you should be able to use armoured cable, or tec cable, such as a local industrial electrician may have in stock.
When you ground the shields on your encoder cables, make sure that you only ground them at one end, because they are supposed to act like a grounded receiving antennae, not forming another circuit.
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