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As a quick diagnostic test, you could wrap tinfoil around the wires inside the controller -IF- you shut of the power first and can be certain the tinfoil would be nowhere near any source of live power (i.e. screw contacts for 120/220 v).
If the deviation is less with the tinfoil, then you would have some evidence that a proper shield on those wires would help/solve the problem. If there's no effect at all, then it might be something else.
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