Plants leaves curling

So my new growth is starting to twist. They looked good up until my last feed which was 700ppm of maxigrow ph at 6.0? Did I hit them to hard?

I have other strains that got the same water and don’t look that bad at all?

looks more like a PH problem than concentration to me. Not that bad though.

Flush the plant with ph'd plain water as prevention and double check your mesures on next feeding.

I know the ph was good just recalibrated that am and tested it on my known RO system. I’ll keep watching them

On second look your plants look fine, that curling is normal on early growth.

Here, have a look at my plants looking quite simillar.
top left and top right plant curling inward