I just use MG potting soil with the 6 month fertilizer in it to start my babies. i do not feed them until they are well rooted since the soil has the necessary things in it. I have never used cactus soil for my CC but then I do not do things like other people do most of the time.
I do not even buy African Violet soil for the AVs. I do mix my own medium when I propagate them, but other than that I use the same MG for every plant in the GH. Some people will frown upon that, especially the men who are really into the soil thing. I am too old be testing soil etc. The serious growers will frown at my methods, but again, I do what works for me and what makes me happy.
When propagating plants becomes too complicated I get unhappy and that is not why I am in this business.
I am sure someone will give you a better answer than this, cut I had to get my 2 cents in since I am very successful in what I do even if it is not the norm.