Over fertilized or underfed?

Hey guys, so I have been having a problem with my plants lately. As you see in the pictures three of them are yellowing showing signs of deficiencies but I have been feeding them. The back left looks completely fine no signs of deficiencies although the last feed did turn some of the leaves at the top a lighter green. The last time which was five days ago when I watered the PH from the runoff was 7 to 7.2 on each of the plants. I did correct that three days later with the next watering being adjusted to 6.0. I have a day or two left till my next watering to tesla runoff again to see a more accurate pH runoff. I have been feeding these ladies roots organic Master pack at 1/4 of the recommended dosage. Would you guys have any suggestions? Am I over feeding, underfeeding or is it just a PH issue? You can also see that the tips of the leaves are burning so my best guess would be over fertilizer and PH issue.
 

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