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Measuring Current on DC Power Supply

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xavier60:
Many single op-amp packages have the offset nulling pins. The TL081 just happened to be the first one I found that has an input common mode input range including the +rail.   An op-amp with better offset specs can be chosen.
Providing the -5V control rail is sounding like a good idea. It will allow the MOSFET to be properly controlled by compensated CV and CC op-amps via OR-ing diodes with a constant current source for Gate pull-up.

xavier60:
With the  -5V control rail, IC2b can fully control the Non-inverting input of IC2d directly via a diode, eliminating Q2.

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