Week 6 of flower - Need help ID'ing my issue - Could either be low pH or light burn but not sure.

Hi Everyone, Thanks for looking at my post.

First grow - Week 6 of flower . (Bruce Bangers and White Widow - both Fems)

Ive got issues that I think (in my limited experience) could either be light burn or low ph (which could create a magnesium deficiency? ). I just read the plant toxicity guide, some of the example pics didn't load (i think they're broken on the post. https://rollitup.org/t/have-a-plant-problem-check-here-first.157345/)

Everything else in the room is pretty spot on, temp, humidity and airflow.
Needing some experience from the community to advise if possible.

I'm starting to get some discolouration a week ago - it's getting worse. (photos attached).

Situation: I've got a 50/50 coco and organic soil grow (wanted to test what worked better for me so I tried a few pots of each) . Watering with 5.5ph water (this could be my problem) or it could be distance from light. I let my girls veg a bit long due to grow room build delays. They got a little big before flipping. Growth has levelled out and they're pretty close to the light. Closer than I'd like.

I am starting to up the ph of the water to 6.5 using ph UP. Lights I can't do much more than I have as they're near the roof but they seem to have stopped stretching.

what's weird is some plants are absolutely perfect , whilst the one next to it is showing symptoms. Happening on both coco and soil. So it isn't a 'media' issue I don't think.

Watering once a day. Following the instructions on the bottle for the coco. Soil gets an organic bloom mix once a week and not too strong.

Thank you in advance, your help is really appreciated. Im so close to harvest. I wanna keep them on the rails till they graduate!

Thanks
 

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