Jo, not sure what the orchid mix would add to the succulent mix but orchid bag says "improved...moisture retention" on it which I am not sure you need for succulents that don't like their feet kept wet.
I find that a lot of succulent mixes contain a lot of perlite which you can't avoid if buying at box stores. I try to find soil mixes that have less of that and more of the heavier kind of lava rock granules. Not all cactus mix are created equal and so I go to the nurseries and check out their samples of cactus mix before I decide to buy. I buy E B Stone Cactus Mix. You can't tell whether there is lots of perlite unless you look at the mix.
Another thing you can do, which we discussed is adding your own rock. I have gone to aquarium stores to buy supplementary rock to add to that special pot but it can be too costly to buy extra rock for lots of propagation and planters.
What little I see of your plants looks fine so far...
Lastly, I am not real picky about the soil I lay my succulent leaves on to root. It is the final pot I put them in to grow that I get more concerned of the soil make-up...
