m0useanswered grow question 2 years ago I use Gaia Green a lot and there formula is not fortified in magnesium, its got pretty much everything else but magnesium.
I would recommend adding in 1/2 tbsp once a month or two of epsolm salts. Adding in some extra microbes if you don't already is also a great option, black strap molasses also goes a long way with Gaia Green in soil based grows but I see you all ready do this. I would only do it once a month as well to much sugar in the medium can cause some issues.
PPS, if your using power bloom and all purpose, the only extras you need are worm castings, magnesium and some seaweed for extra K, or well this is what I find when growing with them. all the extras dusts can cause some sludge in the medium, maybe one add it once your mixing it up at transplants but they are all oxides and not readily available to plants and can take time to break down.
In short, I thin you need a bit more magnesium and less rocks dusts. I am for 6.4-6.8 PH and have not been disappointed. Watering is also a great point to note, only as needed and allowing it to use up a lot of it before adding more.
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Best Of Luck!