I said to you, but will advise one more time !!!
If you overfeed with nitrogen it cuts out calcium, when calcium cut out all other nutrients are struggling to be absorbed, especially magnesium, that's why they go together.
Now your soil is full of food, you were adding CalMag, but plant already shows signs that can't uptake all, so build up is forming.
Just 6.3 pH water , dry out, water, dry out, water. Only then you can return to BioGrow and most probably open bio bloom too by that time.
All the best !
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