Claw ~ Curling HELP!!!

I got a CLAW/ CURLING problem that i have tried to address but still no results.

*Before Problem*
1000w HPS
18~6 veg cycle
Bubbleponics (homemade)
Temp at top of Girls 74-76 (constant w/light on)
Temp at top of Girls 72-75 (constant w/light off)
GH Nutes @ 1100 ppm
PH @ 6.0
Nice Dark green
FAST GROWTH

*After Problem/ Current*
1000w HPS
18~6 Veg cycle
Temps SAME
800 ppm GH nutes
PH 6.0
DARK GREEN (NO Yellowing)
SLOW growth

About two weeks ago everything was running smooth. I went to pick up some more nutes and got a great deal on a ionic mister so i bought it. After putting the mister in and got it going for about 2-3 days i noticed one morning some tips were CURLING bad by mid afternoon most of the fan leaves were claws and i took action right away.

Once the claw started i took out the mister, drained my res, cleaned the whole system & roots with fresh ph'd water. Then i filled the res back up and dropped the nutes down to 800ppm (because from what i read it was over nuting) and 6.0ph etc. They perked up a little bit and that was it...

You haven't mentioned your humidity. Sounds like it could be your humidity. a constantly high RH will cause this. Also just a suggestion is your light better that a foot from tops. Had that happen to me was quite a education I was taught by my girls! Hope this helps. Good luck!

humidity isnt very high in the room. My temp/ humidity guage broke(f-ing dog) and i only had a spare temp guage.... So yea it might be that...

My light is about 18in. away from the tops, temp at the tops is 74-76.... BUT i have a 4in clone i just put in there and she is starting to do the same thing.

Here are some pics...

RED is problem area
BLUE is new growth that shows no curling issue...


WTF !!!!!!!!!!