Thanks Ron. Considering lower than design input voltage (12 vdc vs. 30 vdc), wouldn't that reduce Vref that LM723 sees (compared to it's required 7.15v), and wouldn't I need to change some resistor values (which ones) to compensate for it?
Also the one-third potentiometer travel is not at the start or end of the potentiometer range but rather somewhere in the middle of its range. Should I add any resistor in series with the potentiometer wiper if I change its value from 5k to 2k?