Charlene, you posted at the same time I was trying to make sense out my last bit of long-windedness.
I always allow room for other components and my "mixtures" are not meant to be precise. In that one I likely left out things like granulated charcoal (the kind you buy in an aquarium store), vermiculite and all sorts of things I add such as organic compost. I'll try to go back and check that one out.
The point is to make the soil similar in composition to the floor of a rain forest. There are always trees falling, burning and leaves rotting so the rain forest floor is highly organic. Just mix th soil with that in mind.
I try to spend time learning about the area the plant originates and from then do my best to duplicate it.
Steve