Thin new growth

Hi everyone,
So I’ve noticed that my new growth is quite thin. Any ideas what might be the problem. I’ve flipped to 12/12 about 2 weeks ago theyre starting to stretch. Not sure if it’s normal at this stage of flower or a deficiency of some sort. Ph sits around 6.2 using advanced ph perfect nutrients and tap water (not sure wether to add ph down to correct it) ppm is 800 it goes down to 650 in 2 days.

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It’s just growing fast, it’ll fill out