If I remember correcly, flowering is better to keep your pH on the high side: around 6.7---
If you are cheking your pH using the runoff water that comes puring through the holes on the pot after you water, then allow me to tell you that that is not a correct reading of your soil pH.
Soil has a strong boffering capacity, the pH of soil will not change drastically after only one watering... And donīt expect to make that much of a difference in the soil pH by only watering, it takes some time to change.
For example: My soilmix which consist of mostly peat moss that is very acidic, some perlite and limestone to make it a bit more alkaline. I water my plants with a pH of 7.0 all the time, and my soil pH is always around 6.5... Even after month of watering at 7.0, the soil stays at 6.5 throught out the entire grow.
Oh, and when I test the run off water from the pots after watering it shows a extremely low pH... this is why I advise you not to use that as a reference.
I bought some peace of mind once I got my soil pH tester, it cost me 70.00 dolars but it was worth it.
this is the one I got
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