I think you’re misunderstanding what I was saying. The pH of your water input is almost irrelevant because of the buffering capacity of the soil. You can water with 7.5 pH water and it will never change the pH of an acidic soil in the course of multiple grows.
Furthermore, the OP was measuring the outflow. Either you missed that, or were talking about the outflow. And what I was saying is that when people talk about pH of water in soil, they’re talking about the water inflow. Ignoring that the inflow pH isn’t very important, you don’t adjust your inflow pH based on outflow pH.