Are you using R/O water or tap water?
Can you use the flash on your device, or turn off the HPS for pictures which matter (everything orange, don't mean jack, there's a sticky about this)
If you are using R/O, are you using cal/mag?
This to me, given the terrible pictures, looks like nutrient burn. You neglect to say how you drop the PH, but it sounds like you do it by adding more nutrients? Protip: All caps just makes you look crazy, it makes the things you write harder to read (been on a freeway? Exit signs are normal, not all caps? People read by recognition, not by letter), and... less clear.
With what you have posted, useless, their done, if you can make a more detailed post concerning what type of water you use, the nutrients you use, in what amounts, the PH AND PPM, etc... you'll get more help. Given the fact that you have to knock it down that much daily, you probably have root rot issues though. It's good that you provided info, but it's not the right info... get some good pictures, and take a look at your roots, check your PPM, and go from there.
EDIT: There's a good sticky in the DWC forum about beneficial tea, hit it up if then roots are brown, which i expect they are (been dealing with it myself).
EDIT2: If you go with the tea, drain once, fill with tap water and h2o2, let run for 24 hours, drain, flush twice, refill, add tea, but not nutrients, then in another 24 hours add nutes.
EDIT3: if you're using tap water, let it sit for 48 hours before you add it back and add the tea, flush with straight tap water, the chlorine will only help if the tea is on hand, but make sure you use R/O water or something when you add the tea if you can't let the chlorine evaporate, as the chlorine will kill the beneficials just as it will the baddies.