What are your watering practices?
are You allowing a certain amount of dry back in between feedings?
are you keeping Them too Wet for too long?
What are your environment variables?
temp
RH etc!
With LED you should be pulling well over 1GPW
1GPW was under HPS to know you’re doing a decent job.
Watering practices.
First take water temp and determine how much water to heat to bring temp into the 72 degree range. While that's heating I take PH of the water. Next I start mixing nutes at recommended levels potassium silicate, micro, grow, bloom, king kola, a little unsulphered molasses. Adjust PH to 6.7 and start watering. A half gallon in each pot wait for that to fully absorb and then give each pot another half gallon ..... Wait for that to absorb and add another half gallon. At this point I am just starting to see a little water start to drip. Wait 15 to 20 minutes and give one more half gallon for around a 25% runoff.
Are they getting dry back between waterings.
I feel like they are
Are they staying wet too long?
I don't think so. It takes that gallon and a half everyday before I see any runoff.
Temp is currently being allowed down to 65 during the dark period and will raise to 75 while the lights are on.
RH
Running dehumidifier on 60% right now will begin lowering it to 55% in about a week then to 50% in another week will leave it there until the last 2 weeks at which point I will lower it to 45%.