

How deep should I pot this p. Succulentum?
Got the plant 3 weeks ago in the black nursery pot. Now planning to repot it in 90%-100% bonsai jack gritty mix (maybe with 10% worm casting). It’s outdoor in Southern California so it’s getting lots of sun, warmth, not a lot of humidity.
I found some of the hairy root was starting to rot when I took it out of the nursery pot. I thought it came in a 100% lava rock medium, turns out that was just the top layer. The rest was gritty and sandy — I was overwatering it for a few weeks.
I trimmed off the rotten hairy roots now unsure how deep to pot it. It was sitting at the red line. I’m new to caudex so I don’t know how depth interacts with other things like a fatter caudex/ branch growth/ rot risks, etc.
I also am debating on which pot to use. It’s got a rigid root system so it needs a big pot (like the groovy one, glazed) to accommodate its widths. I’m kinda terrified that a big pot will make it rot more likely.
Alternatively I can stick with the nursery pot since the roots have already adapted to the pot shape and it’s smaller than the alternatives.