I think you might be going to crazy with the ph you dont always have to ph water. honeslty you should be adding nutes to water let it bubble 24 hours then check ph and see what its at then ppm is also important with autos like 750 ppm in full bloom has done great for me. Less is more when it comes to autos. I use tap water also and have no issues my tap ph is 7.6-7.9 after 24 hours of sitting after nutes I can get it to 6.2 the lowest or whatever I feel like with no ph up or down. Just organic nutes.
I have bio bizz fish mix and bloom and I always have problems later in grow and bloom. I want to keep it simple next grow. A big jug of some chemical based fertilizer and ph adjusted to 6.5.
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