If your runoff is 7.9, that is way more than a little high. I'm surprised you don't have lockout problems but I'm glad you're getting lucky.
I am fighting a similiar issue with crap soil and using un-PHed tap water at 8.4 just a few times. I then PH-ed today's water down to 6.3-4 that was giving me a runoff of 6.7-8. I tested runoff, Ph-ed it down and ran it through again.
Did you add lime?
What is the PH of incoming water?
You may want to consider repotting.
eastbaygordo Reviewed by eastbaygordo on . DROOPING PLANTS NEED HELP I have been trying to just read all the post n such on the web, but it looks like i have to ask for some direct HELP. Have some plants indoor in soil they are about 5-6 weeks old. Messed up and put them in outdoor potting soil and added some vermiculite. (not able to get ocean forest soil in my area) plus it cost too much to ship a couple bags here. Recently bought Fox Farms Trio Ferts for some type of nutes. Just really started feeding them yesterday. Tried to hold of on watering because i Rating: 5