There's a lot to be said about PH and organics, you should check it out.If you start off good good soil with a good population of microbes with good stable food then it shouldn't worry unless you see something drastic. I rarely worry about the PH with my organics.I use a cheap soil probe. Never test the run off but I never have issues with PH.With synthetic I use PH Perfect Sensi from Advanced Nutrients and Iguana for organics along with guano, ash and seaweed. Your plants look fine, I'd let them do their thing.
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