leaves curling down

hey guys this is my first time using this site and my fourth indoor grow.

My berry ryder auto in soil has recently started to droop with the leaves curling down and have also gotten slightly pail. (slightly yellower but no spots or anything just lesser green then they were) I've heard adding epsom salt may help that?

I am currently at the end of week 3 in 2 gal pots under a 600w hps @ 75% for 18/6 hrs

I am using advanced nutrients products ph perfect sensi a/b bloom and bud candy @ 350 ppm on my hanna meter

I recently swapped from tap water to distilled and am wondering if that may be my problem.
heat levels seem fine averaging 75-83 day 65 night with humidity average 35%

I am also using c02 pads and plenty of fresh air circulation.

This is my first time using auto's but i feel that they are also growing a bit slow.

Looking forward to feed back. Thanks!
 
It's hard to tell because you took the picture with the light on and it makes everything look yellowish. I would say the room is too hot but 77F is a good temp. Stick your finger into the soil, is it wet as hell? over watering can do this!!! What all nutrients are you giving them beside the PH perfect sensi bloom A and B? At week 3 they should be getting Sensi Bloom A/B, B52, Nirvana, Big Bud, Carbo Load, Bud Candy, Sensizyme, Bud Factor X, Rhino Skin (or Silica Blast from Botanicare. That's what I use) Cal-Mag. I hope I mentioned everything. There are so many bottles it's easy for me to forget 1 or 2.
 
I think what happened was the soil was very dry when i got home late the other day so i watered them really heavily. maybe to heavily? but i am also feeding them bud candy for a carb load and the hobbiest bundle from A.N. is in the mail (arrives today) and tomorrow morning I will give it the vodoo juice, b-52 ect. just off the AN feeding chart at 1/2 what they use.

They have also perked up a bit since yesterday and look a bit more happy, I'm also thinking they got a little shocked when I swapped to distilled water. But at the moment I have only been feeding 350 ppm and working up from there, I hope I am not depriving them of anything, I'll go up to 450ppm next feed
 
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