Less is more for me right now as well. My soil mix seems to be pretty fine on its own. Adding nutes (like I did a few months back) only burned my ladies. Got it dialed in and haven’t had to add nutes this run and my ladies are green green green 
I needed more perlite, and a bit of sand to loosen and aerate my black dirt, but it seems to be working now
@the_bot if your mix is too heavy, and roots not getting enough oxygen, the leaves can look like that. vermiculite and perlite doesnt sound heavy, but it has the capacity to hold water for sure. Have you lifted the pots, felt how heavy they are? I find mine, even with soil, to be kinda light when the plants are happiest…
Maybe try watering slower, I do it with a 2 gallon sprayer, and less??