DAC controlled LDO as current source - Pt.2
Instead of bringing OUT back to the negative output, bring it back to the negative input instead of ground.  The negative output can remain disconnected.  Using the -0.5 variant of the op amp gives you plenty of range on the input, but you're limited to 5V on the output...that can be solved by putting a series resistor between the op amp output and the set pin (82K should be about right).  8V supply with your load limits you to 2.5A, but replace the 2.2 ohm load with something lower impedance to solve that limitation.  This should get your control loop functioning, some further calibration may be needed.