[DR0ck]

At pH 6.5 and above, the absorption of micronutrients like calcium, magnesium, and iron, which seems to be what the plant is lacking, begins. If you consistently water with that pH, the soil will become too acidic, and you'll need to lower it. After a few days of watering with a lower pH, it will reach 5.7 or 6, allowing the roots to absorb nutrients more effectively.

Sanity check: higher pH is more alkaline, lower is more acidic.
"If you consistently water with that pH, the soil will become too acidic" - I think you mean too alkaline. As written, you're saying watering at 6.8-6.9 makes soil more acidic, but that's backwards: higher input pH should push soil pH up over time, not down.
Also, you're recommending I water at 5.5 to bring my soil to "5.7 or 6" but 6.0 is generally considered the low end of the workable range for soil, not a target to aim for. My actual slurry (6.4) and runoff (under 6) show my soil pH has never been in the "6.5 and above" zone you're describing as the problem so by your own logic, my symptoms shouldn't be pH-related at all. But separately, I've been theorizing that she's low on nutes because I never fed past the original FFOF and one dry amendment. Since I've started feeding things have improved. The slurry disagreed with the runoff. Ive corrected for that too. So between that and the feeding things seem to be moving in the right direction.
Appreciate you weighing in, but I think the direction here is off.

 

[GNick55]

your next grow quit using any ph stuff . ffof does not need to be ph’d,. i’m surprised no one has mentioned this,
i’d stop using it now,..

 

[DR0ck]

your next grow quit using any ph stuff . ffof does not need to be ph’d,. i’m surprised no one has mentioned this,
i’d stop using it now,..

If it doesn't need ph adjustment in the first place, does adjusting irrigation pH cause issues? Seems like it's made to handle a range of irrigation pH?

 

[GNick55]

If it doesn't need ph adjustment in the first place, does adjusting irrigation pH cause issues? Seems like it's made to handle a range of irrigation pH?

well to me the ph ain’t helping and if it’s the ph up or down than it’s a chemical going into an organic grow,.