I had mine apart recently again to look at some stuff. I tested <80 milliohms between crimps and driver pcb contacts. Used my LCR tweezers. No issue with contact there on my pair. It could be quantified. It could be the contact surface or the crimp quality perhaps. When I had issues with imbalances I couldn't find anything quantifiably wrong with the connectors and sent them in. DCA replaced the drivers.