OK IMO first thing since your in Ocean Forest I would Try 1/4 strength are around 300ppm
600 seems a little strong to me. This is what I do, I start at 1/4 strength then move up if need
be, my exhaust fan stays on all the time, and 2, 8 inch fans down low blowing up at about 22.5
degrees. I use 20/20/20 in veg and 10/30/20 in flower 1/4 strength temp stays around 76
Fahrenheit RH 45 to 55 I do not like to go above 60 RH, that's just me I've had real good luck
with that environment. Looks like you are blowing all your hot air down on your girls which is full
of Humidity and O2 CO2 is heavy stays lower blow your fans up exhaust your hot air and give them
fresh air with less moisture. IMO you'll notice a big difference in 24 to 48 hrs... Also i run my 1000s
at about 80 percent during flower I have 3 in my 4x4 flower room.