drooping baby plants

ok i started feeding nutes 4 days ago, feed them that nute water just 2 times so far

i kind of put too much sensizyme (60ml) in 4 gallons
also added advanced nutrients micro/grow/bloom added about 10ml each

added first micro, mixed good, then grow mixed good, then bloom mixed good, then sensizyme in store bought water (NOT DISTILLED)

i allow rockwool to dry out before watering, the one thats perking up with the skinnier stem (smallest looking one) was drooping bad from underwatering yesterday morning, so i watered them and it perked back up

but the other ones are still drooping.. so i know its not underwater/overwater

my ph is constant at around 5.5-6.0 never lower or higher
ppm is 470 (was 440 when added nutes, now is more cause of PH down?)

i add about 2-6 drops of ph down per day through out the day

this morning i feed just ph 5.5 water that contained 1 drop superthrive/gallon


the tips of the leaves are NOT burned at all..

i have a 600HPS inside cooltube that is 24" above (was 29" before, just moved it closer) no sign of heat

i have AC on 24/7 temperature 74-79, humidity 33%-40%

can someone please help!! why are they drooping??? and why are they turning a lighter green/yellowish color ?

ok seems like it perked up a little bit the droopy ones, but the leaves are still kind of light yellow in color, no burns on them or spots just very light yellow mixed with green, is this normal?

ok they are just fine... i guess it was over water or under water but they are fine now turned back to dark green nice color no yellow, honestly i think it was cause they were hungry cause i was feeding very low dose of nutes (but im not sure since this is my 1st grow and im newb) if you wanna see how their doing check out my signature