what does this look like to you-- over feeding or light stress?

Hey guys, so I'm running 4 plants in an aeroponic system, and just finished harvesting my white lavender soil plants. Btw, for anyone who is following I don't think I'm quite gonna double my grams per watt from my first run; it was .56 the first time and this time it'll probably be closer to .9, but I won't know until after I crop out these aeros.

Which brings me to my main point--i started noticing some light stress on my cotton candy plant (pretty sure this one was definitely light stress-- the soil plants were lower and so before I cropped them out my light was a lot closer to the aero plants).

But now I'm starting to see some things on a few of my other plants; the purple wreck is always kind of droopy, with yellowing occurring at the very tip of some leaves (no brown/necrotic tissue just yellow and just the very tip) and my desert diesel has this weird thing going on in the "middle" of its leaves. This is the one that I am not sure if its from over feeding or light stress, as this plant is also right under the light.
View attachment 2984540View attachment 2984541 I took the pic with the flash on and off to see which one is easier to see.

I really don't think its a deficiency, bc I'm running botanicares expert feeding program, currently at week 4 or 5 @ around 1900 ppm. Often tho, my ppm will go up over 2000; I usually add a gallon of water at night to take it back down and then let it climb again throughout the day. The pH also climbs, gets up to 6.5-6.7 every now and then, and I'll usually take it back down to 5.3-5.5.

The weird thing is, I've had these plants about 100-200 ppm higher than the feed schedule for about a month now. They've vegged for 6 weeks and have now flowered for 4, and I haven't had any problems--and they've been between 18-1900 ppm for like 2 or 2 1/2 weeks, and they have been taking it fine. The blue dream is still doing amazing:
View attachment 2984550

I'm starting to wonder if maybe I have some root issues going on. The root mass has gotten too big for me to pull the plants out and check, but I can check the blue dreams roots and even tho the plant is fine im starting to worry about the roots. Tried using bennies but for now a sterile res has been easier for me.

Thanks for looking guys, hopefully the Dr. House of weed can come in here and diagnose my shit, lol. See what's going on.
View attachment 2984553View attachment 2984554View attachment 2984555

And here's a shot of the light stressed cotton candy next to the healthy blue dream:


Thabks again guys. And as always, + rep to anyone helpful. Now here's a double bc the internet is stupid.

Dammit, had to restore saved content and it does that dumb shit. Lemme post the first 3 pics again:



And here's the dankola, the blue dream

Hey Thor, they look very nice. what is the wattage on your light and how far is it away from top's of plants? this may be a factor. Also I have experienced curling leaves with having too much nitrogen.

Hey treedabler, the ballast is a dimmable 1000w with a turbo setting (turbo= +10 or 15 percent, so its like 11-1150w) and prior to cropping the soil plants, the light was about 18 inches @ turbo setting and the bulb was directly above the cotton candy.

Since then I've raised it to about 24-26 inches, but then started getting the weird thing on the leaves with the desert diesel, so I kicked the ballast down to 1000. The next day it seemed to be progressing with the diesel so I started considering that maybe it was from overfeeding and kicked my ppms down from about 1900 to 1600 and have been letting it slowly rise from there