If you can set I of the power supply through a connection with the labjack then you can make a simple predictive control of the required
The HP/Agilent 6555A power supply has an analog input for voltage set point, but not for current. I was thinking to code it as a closed-loop servo, with the available power measurement from the Tek PA1000 as the control input. It would be a nice project but not in the LENR critical path.