Hey. Thanks for sharing a look at your garden. It looks good. You’re heading for a frosty Xmas If I made a suggestion it would be that they are a bit shaggy (and I’m very prone to letting this happen). I think they would be happier (and this may be controversial) if you trimmed off a bunch of mass. First I would take any damaged or affected leaves off. Then I would look at the little branches near the bottom. Those aren’t going to give you shit so get rid of them. Then look for leaves that are shading bud sites and get rid of those. Not suggesting you go crazy and strip them down completely, although you could. Just clean me up a bit.
Another thing, and this is again just an opinion, I would ditch the cal mag. That’s not for soil it’s for hydro. Take a look at the sticky threads under organic soil and read the one Called “what calcium do you need” or some such. Epsom as mentioned is a better choice. However, I would be surprised if there was no calcium available in your soil. Instead something may be locked out or out of balance. Go easy on the nutes. The girls are winding down their leaf growing and putting it all into buds. Watch your watering. Make sure it’s just right. Flushing with water is great for stripping away salts, but it can lead to root damage and nutrient lockout if you’re not careful.
I used to use FF stuff and grew a lot of dank weed with it. The method is in between the organic soil and the hydro camps. Because of this you can get weird advice like “add cal mag” when it really does not pertain to what you are trying to do. In organic you are trying to create an environment in which the plant can take what it needs from the soil as it would in nature. In hydro you are in a sterile medium giving the plant what it needs with chemicals which are formulated so the plant can take them up directly. The FF route is a sort of in between.
Anyway. I hope this helps and I hope you will keep posting pics so we can see your results.