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I have some 5 year old trichocereus bridgesii that I sadly haven't repotted in 4 years. The tallest ones in the picture are about 53cm. This year will be a good year for them because not only will they get a new large pot (or pots) but they get to leave the 4 year old store-bought cactus soil mix I used at the time! I'm thinking 1 part garden soil, 1 part pearlite (or pumace) and a small amount of sand for the new soil mix. My question is this: I was thinking about burying them about 10cm deeper than they are now, which would put the thin 1st year of growth under the soil and hopefully make them more stable (see picture with drawn lines and text). Not only is the bottom of the cactus thinner than the top but a few of them are also leaning at the bottom then they curve up to vertical at the top. Is this a bad idea? Will I rot out the bottom? I live in the cold north of the US so they've been grown indoors and have a pretty controlled environment. I'm also hoping by mixing my own soil this time it will be better draining and not rot out the newly buried portion.