Hi,
I always find CC feedback more difficult than CV feedback.
The problem is that the loop gain mainly depends on the load.
* There may be a low ohmic load resistor, where a small change in voltage causes big change in current.
* There may be a high ohmic load resistor, where a change in voltage causes only a small change in current.
* There may be an inductive load, where an immediate change in voltage causes only a slow change in current.
* There may be an capacitive load, where an change in voltage causes only a fast change in current.
... and everything inbetween.
Thus I can just give you this information but sadly no solution.
Klaus