I hit the reply button by mistake.
If this is the only ph meter that you are using this will be part of your problem.
The pots need to be elevated off of the plates or the post will reabsorb the run off water keeping the lower part of the plant wet causing root rot.
It looks like you are going by if information that is posted on ILGM about strain.
All the information on strain (yeald, height, flower time, thc%) all that is from a plant grown under optimal conditions. The only thing that will be even close will be the flower time, but that will change depending on trichome color.
You keep saying you have a 600 led. It may be branded as a 600 w led. but it is only a 150watt light.