The power supply in question is an HQ Power (Velleman) PS1503SBU (Amazon: http://amzn.to/1Xj50dP ; Jameco: http://bit.ly/1X6DLs6 ). I was able to replace the factory single turn pots with these 10-turn pots from Jameco ( http://bit.ly/1X6ApW0 ), and now have more precise control of the voltage and current settings.
The formula for adding the 22k pots in parallel to the 10k pots is: Rtotal = R1×R2/(R1+R2)
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