Severe Yellowing

Hi all-
First time outdoor grower and I’m dealing with severe yellowing mid-flower. I hit them with a full dose of FF Big grow yesterday but I’m looking for any other advise for how to get the plants what they need ASAP. Seeing the beginning of the same with an autoflower I have too.

Here’s the deets:

  • Strain: Bag seeds from a dispensary delivery
  • Method: Soil (420 Blend), FF Trio
  • Vessels: VivoSun 5 Gal fabric Pots
  • PH of Water, Solution: 6.3 - 6.5. I previously had the pH way too high (tap water is 8.9) but I flushed with 6.5 a month ago till the runoff was clear and then started with 6.3-6.5 water & nutrient solutions
  • PPM/TDS or EC: Haven’t tested
  • Indoor or Outdoor: Outdoor
  • Temps; Day, Night: 60 -80 (55 -90 extreme)

Looks like general nitrogen deficiency.