MIMedGrower
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If your PPMs are as low as you say, the problem doesn't sound like overfeeding. Your Ph values look pretty good and your light sounds more than adequet unless too close. Did you just start using any new lights recently? I'm not familiar with your nutrient, but I would try to get a general purpose fertilizer with some, but not a ton, of Nitrogen, simply because you are in flowering (otherwise I'd use 20-20-20). You aren't showing Nitrogen toxicity, but bad P/K ratios can cause lockouts... not sure if it would show up on a PPM meter like some things do.
On a side note, they could also be approaching the end of flowering, which often causes leaves, especially the lower fan leaves, to yellow and drop off. With the small pots that they are in, the nutrient reserve isn't too high an they might just need a snack... unless it is just old age!
Its a coco grow. Could be a calcium thing or need more feeds per day or something. I figured i would bump the thread for a coco advisor again since you commented too. :-)