Hi there! Yes. I succeeded changing the cable for the new version. Problem is solved. Did you meter power at the head with all emitters at full? I definitely found that with everything at full juice, there was a slight voltage drop that I thought at the time was negligible, but it turns out it was the cause of the issue. The new wiring harnesses I installed looked and felt identical to the old ones, but definitely solved the problem. My only guess is that the original harnesses must have had some manufacturing defect in the actual wire.