Schulze

I am not playing devils advocate but looking at the video you just linked I wonder were you trying to make a flux capacitor ?

I mean whilst its not quite 4 times the max length (I think they were exaggerating) your battery cables are way to long and looking at the way they loop around and remember that you have to add the cables in series to get the total effective length.

Put it like this the series link between the packs alone in that video looks to be about 8-10 inches then add another 8-10 for the rest of the y cable then add another 8 inches for the cable to go through your eagle tree and back to the esc.
That adds up to a lot of cable and inductance that needs greater capacitance for decoupling.

I will add that schulze seem to do everything in extremes that includes escs failing in a ball of fire and treating there customers like they questioned there parentage.