is this seriously an argument about phing soil...
jees , email any soil manufacturer and ask.
soil buffers ph you cannot change its ph except through absolute extremes by which stage your soil is completely ruined and your plant history.
my advice is use grow and bloom products according to the manufacturers recommendations, most supply a feeding chart. Then add less if necessary. Throw your ph up and down and ec meter in the drawer for when you try hydro.
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no phing, no ec reading.
just follow the labels and read the plants.
if they look pale add more , too green add less