Did what you said and raised the lights from 18" to 24", took center light reflector off also, i think i definitely am oversaturating them with light, 600+ppfd at 20 hours is 43+ DLI, thats a shit ton for these gals i think, i guess in a way im working backwards to find saturation point lol, now im at 500ppfd, thats 36 DLI, still may be a bit too much light, but im experimenting at this point also so next time ill have a better idea of what to do and what not to do, ill check em tomorrow but the ones on the sides are doin alot better than the center one in the back, and front and center doesnt look too bad for being the same height as the back one showing signs of problems , take some more pics tomorrow and see how they are holding up, make adjustments if i feel they are needed, keep you all posted