An out of range pH buffer will lock out minerals in any media. It’s almost always the reason plants lack nutrition. Often times heavy feeding from veg through mid flower can cause a salt build up if allowed to dry back too much too often tanking pH.

Check the run off pH after watering to make sure it’s also in range.

Limiting root mass, limits the plant’s overall structure no matter how often irrigated. The plant can not and will not produce thick stalks/branches with a tiny root system no matter how much bio-mass is above. The growth will be thin and scraggly. Yield at each node is directly related to stem girth as well.

If this damage was just on the lower leaves I’d say pull them and don’t worry if the new growth looked healthy. I’m seeing random damage all over the plant on the tips of the leaves leading me to believe you’ve got a bit too much available nutrition. I’d back off the Fox Farm Trio nutrients. Deficiencies can easily be corrected in soil over a…

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This interveinal chlorosis is the start of a magnesium deficiency. 1 tsp of Epsom salt (magnesium sulfate) per gallon of water will correct your issue.