I,d say cut down on the fertilizer for a couple of feedings the living soil is ideally supposed to take it through all the way
try and check your PH and give water that is 6.5 - 6.8
i have a very similar setup (heavily composted soil with cow dung and vericompost at the bottom 3rd and the rest topped with a locally bought organic potting soil and perlite 60:40) but the only thing additional in my soil is dolomite lime which keeps the soil at a stable PH (something for the next grow)
it can be the genetics as well for example in the exact same setup i have 3 seeds going on all poped on the same day (48 days now)
2 of them were blackberry auto and they are loving my soil and is way into flower with no problem at all
1 is a GG auto which has just started to flower or not i am not yet sure of it and is showing leaf deficiency/ toxicity (again i am not sure) and i am assuming is not linking the soil very much off late (few pics attached of all the 3 for comparison)
again hope it helps you (not sure)
Happy growing peace
P.S my yellowing is also increasing in the GG auto and would be looking just like your in a couple of days
so hope we get pin point answers soon
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