Well none of the suggestions about star grounding did any good. In fact they made the problem worse than before, so bad I could not even get 2.6 to run. Off this list I was sent the AB servo best wiring practices pdf which explained how to reduce noise in a servo drive enclosure. I followed the advise as much as possible and after removing all my ground wire antennas I was back running with an occasional sserial error. The short explanation is to terminate the shields to a ground plane as close as possible to the point where you take the shield/drain wire from the cable. I still have a cable bundle running to my switch box that is parallel wires and I might replace that with some twisted pairs. Photos at 11.
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