m0useanswered grow question 3 years ago You don't typically water till runoff when growing in soil, will drown the plants root system unless its heavily amended with perlite. not ideal.
you can go down to a PH of 6.2 with BioBizz Nutrients in soil as well.
Its best to let it sit out for 12hrs before adjusting PH as it drifts over the course of that time.
It would also be in your best interest to invest in a TDS/EC Pen, when using liquid nutrients its a great reference point to confirm your feeding concentrations and troubleshoot any issues.
Good Luck!