Best Potting Mix for Succulents?

[Arizona Jeanie]

I've been potting and re-potting some small succulents, Echeveria, Sedum, Sedeveria, other unknown similar hybrids, and larger probable Epiphyllum and Crassula. Some I found had quite a bit of sand mixed in with the potting mix I was removing. This had set up like adobe, actually interfering with drainage and leaving just a small space at the top for roots. Needless to say, the plants were struggling.
So now I'd like to get these guys out of the adobe and into some proper fast-draining succulent mix, but...what would that be? The Miracle Grow "Cactus Palm and Citrus" mix is the easiest for me to access, but it seems to have a lot of wood chips and doesn't look that different from the usual houseplant mix. Can I just add a lot of perlite? How about adding in pea gravel?
I'd appreciate any advice and recommendations!
Thanks