I upgraded my KISS quad by putting a 470uhf 50v capacitor on each ESC.
Flashed the ESC's to the latest firmware, and also flashed the KISS FC back to the original KISS firmware latest version.
Just did some testflying on default PIDs. It didn't fly perfect yet, cause the PIDs do need some tuning.
Still can't tell if it makes a difference for smoothing out vibrations, it was too cold and windy for tuning today.
It did sound better, though this could be due to switching flightcontroller sofware from Betaflight to KISS.
But the FPV video feed was superclean, better then it ever was.
Before I had just a single 1000uhf 25v capacitor soldered to the battery lead. Which helped a little, but not much.
Already some improvement, now need the weather to improve also, so I can tune a bit more comfortably when sitting outside.