Hmm I cant edit my previous post, so I will post again. I just watered two of the plants because the pots were getting light. One of them, first I gave a little straight filtered tap water just to check a few drops of runoff. The tap water was greenish yellow when it went it.. and the runoff (which was as clear as the water I gave it) was actually a much darker green, so the soil pH must have gone up. I gave the plant 1/2 strength nutes. I watered a second plant as well, gave it straight pHed tap water and the runoff was slightly more acidic than the water I fed it.. but much closer to the range I am looking for than it was a week ago. I also gave this plant 1/2 strength grow big but I added 2 drops of pH up to the mix. Sadly because of the flushes, and different drying times.. my watering schedule is all off, I can't water them all on the same day. I am gonna watch the plants and continue to give them properly pHed water. When the others dry out I will test their runoff and water/feed accordingly. After I gave the 2 plants nutes today, I noticed that my runoff water was coming out the exact same pH as it went in, the soil was not buffering it at all.