I just tested the pcb that is installed into the case and I got the following screenshots.
The screenshots look a little bit different, is the screenshot on the R_Shunt still good (0067.png) ? it looks like the first negative spike is bigger in comparison with the other pcb. In this pcb I used another type of capacitor (for the CV capacitor), but it is also 1nF (it is not ceramic, it is polypropylene capacitor) and the main filter capacitor is 6800uF in this pcb, while in the first one was 4700uF.
The other screenshot is on the output with 32V output and 10R load.
LE: also in this circuit, a analog voltmeter was connected to the output and some of the wires were not the same length as the first circuit that I tested.