I managed to make a few tests using the oscilloscope and the Switch load. I used for switch load 220k/220k/100nF.
Capacitor in CC loop = 2n2, capacitor in CV loop = 470p.
The oscilloscope probe connected on the output of the power supply.
1. Vo=26.6V, Io=3A, a wire as load at PSU Shorter: 29.jpg
2. Vo=26.6V, Io=3A, Rl=10R: 32, 33.jpg
3. V0=26.6V, Io=almost minimum, Rl=10R: 37, 38.jpg
4. Vo=13.9V, Io=3A, Rl=10R:44, 45.jpg
5. Vo=2.08V, Rl=1R, Io=3A: 46, 47.jpg
6. Vo=2.08V, Rl=1R, Io=1.5A: 49, 50, 51, 52.jpg
I added only the results that I considered important.