Hi BudBear,
You are absolutely right. I didn't knew about this until recently, and I every time I made a consultation about some issues on the live help threat I always had been advice to correct my PH. However, when I read about the PH on Biobizz and since flowering I stop usinf PH down. I have been using canna rithzotonic which bumps up my PH to 8 so I was kind of forced to lower the PH.
For my next grow I will provably use less rithzotonic and let the PH as it is. Alternatively I may get Biobizz roots stimulator.