Sence you mention it I definitely have a high ph and nothing I do brings the ph down weather I flush a 4.0 ph the run off is consistent 7.2 or more or less
Update** ran 20 gallons of ph plane ro water threw one plant ph from bottom still 7.5
I usually try not to transplant during flower but if everything else is failing going into a slightly bigger pot and fresh soil is a possible solution. That amount of ph adjusted water going through should have made some change and I can’t think of anything else really besides the fresh start.
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Are you using CO2. If not the lights are too intense. I never run 60 dli in flower and I use CO2. Never