Living Soil is a growing method centered on the microbial life inside the soil. So mostly you don't feed the plant, the plant feeds the soil.
Your plant forms a relationship with the soil, it's root system puts out sugars and the living stuff in the soil takes those and makes stuff the plant needs. All the microbial life is interdependent on multiple levels. It took millions of years, but the system works.
In order to cultivate commercially and at scale and reduce variables in the system, lots of growers chose to take the feeding choices away from the plant. Growers that choose a hydroponic or coco-perlite medium remove the natural sources of nutrients and replace them with nutrients they give in portions the grower chooses at times the grower wants. It is efficient.
I think many seem to mix the two systems. The symbiosis (balance of the exchange) in soil can be interrupted by adding liquid nutrients that are chelated using organic acids or salt-based nutrients. By using such products, the microbial population will decrease, resulting in a less healthy soil. microbes create nutrients that the plant needs and exchanges them with the plant. This precise interaction between two different biological organisms (plants and microlife) can be mutually beneficial for both parties and it can last indefinitely as it does in nature. Unless you mess it up adding things that you would add in a totally different growing method.
Sort of like thinking fire, an oven and a microwave can be used the same or interchangeably. Each can be used to get results, but how is much different.
Anyway, I say all that to say this... I doubt your issue is a lack of cal or mag. If it's living soil, and you haven't messed up it's ecosystem with teas and sugars already, then the plant is taking what it needs, the soil is taking what it needs and your job is environment; water, light and climate. I'd look to one of those things. Over water would be a guess, but just based on the frequency at which that is the problem... Like a LOT!
