I had trouble with the 5:1:1 in grow bags, there were spots in the center that were completely dry and had no roots. I wonder if it would be better in plastic pots?
The Christmas cactus I repotted with coarse bark similar to 5:1:1 is doing great. It seems to love it.
@tapla Is 5:1:1 your original invention? If so, you're famous. There are lots of people on YouTube that have stolen your idea.