Very nice looking plants my friend!👏🏽
Regarding the ph issues you're having, I see that your E.C levels are very high (2.88) I've read that it can effect and change the ph in the medium,
Do you water "run to waste"? That can help you clean all salts buildups in your coco...
I keep my e.c very low, highest will be1.4
Good luck with your grow!🌱👍🏽
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