Help me make my girls happy

Hello guys, having some issues with a few of my girls. Week 6 of veg, organic soil mix(fox farms of/coast of maine stonnington and bar harbor) amended with wormcastings/coast of maine lobster compost and gaia green all purpose 4-4-4. Originally transplanted from promix bx in solo cup to 5 gallon at week 2. Water ph’d to 6.3-6.8 alternating feeds. Watering to first sign of run off, roughly 2ltrs. Temps are around 76-81 lights on and 68-72 lights off with humidity from 45-65%. I have performed a slurry test which led me to believe the plants had already depleted what was in the soil. Was showing only 500ppm from slurry test so I gave plants with symptoms a top dressing of gaia greens all purpose 4-4-4 which was just over a week ago. New growth on some of the plants seems more stable but I am still unsure if I approached this properly. Any insight/advice/tips for a new anxious grower would be greatly appreciated!

Wouldnt allow me to add more than 10 photos in original post so here are the rest.

Looks like overwatered and a magnesium deficieny. Add 1 tablespoon of epsom salt per gallon of water and water it in once they dry out.

Tell more about your watering practices.

I will admit I was overwatering them when they were smaller. As of recent, I have been lifting each individual pots and watering when they get very light. I also use a moisture probe mainly for peace of mind when deciding to water or not. Been trying not to let them dry out too much as I do not want to kill any of the good microbes in the soil.

Also forgot to add that I did do a epsom salt feed when watering after I top dressed last week.

Cal Mag will fix it. Get some dolomite lime and top dress and some epsom salt.