Noticed IP11 and IP9 were still outputting 5000V even though their surrounding pressures were < 1 x 10-8 torr -> Made slight corrective adjustments to the pump current values at which point these pumps switch from 5000V to 3000V outputs.  As found, they were programmed to change at pump currents of 5 x 10-5 amps.  This value of current corresponds to a pressure which is lower than 1 x 10-8 torr which is the point they should be switching to result in the most efficient pump speed.  The new value is 1.5 x 10-4 amps.