Soil self pH's!!!! The pH of the run off is just that......The pH of the run off. Not the pH of the soil....
You do not have a pH or a lock out problem.
Do the pots have a way for any extra water to get out? They cannot "sit" in wetness.
What are you using for nutrition? Big Bloom right? The NPK is 0.01 - 0.3 - 0.7 right? Do you see why your having a low nutrient problem?
Your soil is not a long term water only organic that supplies nutrition through out the plants life cycle! It cannot get what it needs from the soil any more and the Big Bloom is lacking the needed nutrition!
Your NOT feeding enough!!!!!!!
I might add the Grow Big Hydroponic at every other watering and continue the Big Bloom at every. Hell, I would use it for 2-3 feedings in a row to get the soil jacked back to about normal.....
Someone said to foliar for quick responce to the nutrition and to repair the leaves.....You can,,but keep it off the bud sites!
FEED IT NOW!
You had mites at one time eh? I see mite damage on the pictured plant. BE SURE THEY'RE GONE!