You don't need to PH balance soil, it does it all on its own as its a living medium. You can PH the water if it makes you feel better going in, or maybe required for the fertilizer options you use. Just don't worry about trying to lower the soild PH via your feeding solution. That is not done via the water its done with the amendments put into the soil. Lime for upping PH and sulphur to lower it, when the microorganisms break these items down they influence the PH of soil.
Given you're in containers Don't got below 6.4 when watering and try and keep it under 7.5 as well in the solution your feeding them. Some soils can take a stronger dose of PH down as they have more clay and minerals in it. Keep an eye on the plants and if your noticing PH issues back of the PH down.
Plants should do just fine if you keep at it like this.
Best Of luck!
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