How To Use Progressive Web App aka PWA On 420 Magazine Forum
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You are still messing up your pH.
You need to slow down when measuring. You need to calibrate you pen regularly.
Are you using a 2 digit or 3 digit pen? If only 2 it is easy to mess it up because you don't see that it is still changing. Mix up the solution, wait 15 min and take measurements for 5 min. no joke slow way down. eventually you will not need to take so long. you will learn how to do it better. But until then take the time. with my 3 digit pen it can take more than a minute to cycle up from say 5.60 to 5.70 but the whole time it is changing in the same direction and it will keep going and may end up around 6.4 so you must understand that you can't just put it in there and read it.
Swish it around and wait a solid 5 min after letting the solution settle for 15. then you may have a reading you can believe. However then you may need to add something and wait again.
I guarantee the issue is you think you are measuring the pH and you are measuring it wrong. That was your issue in the beginning, middle and now still.
Have patience
Distilled water has no minerals, is your tap that bad? I have seen DI water stress plants.
Cheers