Do i need to Ph water if i mix ph perfect products with none ph perfect

Hi friend, it seems such a simple question and yet it is not. I realized that trying to get a perfect ph at the input (5.8 / 5.9) lowering it further with the ph down, in addition to fertilizers, then on the soil (coco in my case) it would have "transformed" into very low values even below 4! now I only give fertilizers with an incoming pH of about 6.4 / 6.5 I see that that's okay. so I would say yes. they do their job well ph perfect