Ok, i see where youre coming from. I never mentioned watering with 6.7 water. I drop my water to about 5.8-6.0, before i give it to the girls.When i add this water to the plant, the PH reads at exactly6.5 in the soil.
Actually i would have to argue that it is possible to overwater a flowering plant. Like i said earlier, i'm a newbie still in a sense, but i experienced overwatering early in flowering on some of my plants.
This could have been due to undeveloped root structure, like you said, but when i dried it out, watered on a schedule, and got everything back on track, they came back good.
I was just sharing my personal experience with what happened to me.
But, i still agree he needs a better PH tester.
Question? What do you keep the PH of your soil,run-off and feeding water?