Hey there!
You said you're using Promix HP?
Promix HP Mycorrhizae is Peat Moss + Perlite. You could add extra perlite in the future, but most soil mixes will compact after watering if you're not adding anything to it.
To avoid this run some Biococo (Coconut Coir) in your mix for the next run, it'll give make it a sponge, rather than a rock.
I'd say to avoid transplanting out of cloth pots, it'll most likely break the root ball apart and won't end well, for now you could flush them out and toss some perlite in.