I lowered the HV from 7000V to 5000V on IP4 and IP2 for a brief period this afternoon (see attached).  I've since restored them to 7000V,  

Note that lowering the pressure by increasing the pump speed does not exdpedite the recovery from a vent cycle, i.e. change the slope of the pump down.  Rather, time is the limiting factor once in molecular flow barring increasing the temperature.