well King, I never found runoff to tell me much unless you look at it all the time and you can establish trends which are a good way to track things like rising/falling pH over time and obviously if your runoff spike there are root things going on which might cause this. now I know u r like me and are pretty diligent about checking mix pH and such so I am thinking that your runoff isn't going to tell you much in this case.

I might look at my formula after a nice cleansing flush and be certain I was not having a seizure when I measure out my last feeding. should come around, top growth looks great and if it hasn't slowed down might be a nutrient fart and you have a little lockout