Hi Kirky
I use my old standard mix of 1/3 Zeolite, 2/3 Diatomite. I have recently acquired Pumice so will add that to my mix to give about 1/3 of each component.
I do not measure them out, but just chuck a bag of each in a large tub and Mix
Repotting I do in mid to late spring, tho this one was not done this year. any time durign the growing season, but will avoid the hottest part of the year.
I remove about 1/2 of the roots when repotting.
I have a large one I have been ground growing and want to collect it soon to put up

Ken