How about removing the resistor divider?
Pin 3 is the supply and should be connected to a stable supply rail; e.g. the 12V bus bar would be a good choice. Pin 3 and Pin 9 should be connected directly together for bar mode.
Pin 4 should have a lower impedance source - e.g. GND or the VREF of the other LM3914. The 2x 1M resistor divider is no good, adjust the reference by using resistors on the REFOUT and REFADJ pins.
So have you found any real actual engineers yet?