The output of the CV op amp and the GND on the power supply output GND
Vout=21V, C1=220pF, C5=2n2, SlowCC=3A, Rload max=20R, Rload min=1.2K
0973-0976
Vout=21V, C1=470pF, C5=2n2, SlowCC=3A, Rload max=20R, Rload min=1.2K
0977-0979
If I use higher V/div, then I see only the blue trace on the screen.
I used those load resistors, because those values are the most close to the specified load currents.
Please have a look at the attached screenshots and tell me what you think.
Later Edit: The last screenshot show the pin 3 output of the 555, at PSU Shorter. I used 220k/4k7/330nF. Please also have a look at this and tell me if it is good.