If the suspicion now is in the additional power, there is nothing to do, I understand that the 5K + has a 12v power adapter, and the 8KX has a USB 2.0 (+ 5v). No matter how much amperage you put into the USB 2.0 or USB 3.0 port, 5v is 5v and not 12v as in the 5K +. But it seems to me that it is not a matter of food. I have been looking at the characteristics of the sensors, I think I deduce that they are TS4231 and operate at 3.6v. Either there is some HW fault that they should solve if possible with a firmware that correctly interprets the signals that reach these sensors, or they can recognize that the blue paint is impairing the reception of the signal.