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I bring down the ph of the rockwool cubes by soaking them for a few hours in 3,5 and then flush them with ph 5,8 water with nutrients in and then let the cubes sit in ph corrected nutrients solution. I let them drain for 10 minutes After a 3,5 hours.
I can already see the stretch. Vpd is between 0,45 to 0,7 in the night and 1.0 to 1,2 max when the lights are on. Plants drinking as much as they are eating. No Ec building up in my water it as the result.