leaves are droopy- needs some help

Ive had this problem for awhile , In veg the leaves are wilting sometimes worse than other days but its a problem I dont like and if anyone could help I would appreciate it
SPECS
1000 hps, Im in DWC using water farm buckets w/ rockwool with black lids some in 3 in pots some in 5 in pots I use pura vida nutes parts are 350-380 ph is 5.9 to 6.2 the rooms never gets warmer than 73, my humidity is slightly low it ranges from 30- 37, I cant quite get my finger wrapped around this one so if anyone can help I like I said before would deeply appreciate it ,

drop your ph to 5.6 and try to get your room to 75/77 73 is too cold i personally grow at 85 to 90 with co2 my plants love it good luck

i'm not sure how rock wool is with water..but mine drooped all the time and i thought it was too much water..turns out it was lack of water

its kinda hard to get the temps up this time of year and I have a G watter, it never goes any lower than 69 but I cant break 76 and Ive tried even with the inline off I can get there ,for a day now I lifted the light another ft and a 1/2 I will try that for a few days and see

to raise the temps just through in a space heater, I know its a lot of watts but if you can, do it.

scratch that, temps what give you that kind of a problem, it has to do something with the amount of water, too much or too little.