please help!!!

Whats good braddas. Please help me diagnose my issue...the leaves seem to be folding downward (see pic)

my ppm and ph have been on lock with a House and Garden feed schedule with some manipulations. All my other girls are doing fine except two of them (sour grape strain)

quick stats:
medium: hydroton
feed: drip feed at 4mins 3 times a day
ph: 5.99-6.03
ppm: 1200-1760 (at third week of flower) fluctuations in pmm due to topping off feed reservoir everyday. (lowers as the week progresses)

please help me out braddas. im stuck.

Are you sure its getting enough water?sounds a bit high for nutes tone it back.

I Reccomend To Lower Your Ppm To 900-1000.

Thanks ffor the reply braddas...I figured it was the high ppm. I just never thought that since I topped off my reservoir everyday that the first initial ppm of my feed cycle of the week would kill the rest of the week. I factored a few things and will be cutting everything (micro and macro) by 30-65% which would drop me to about 1200-1500 ppm at initial concentration.