lockout. get ph in the 5.8-6.2 range. You could flush by running 2 to 4 times the volume of your containers, or start pushing solution that is 5.8 (on the dot! not 5.7)

In veg, that's what I would do. just start using 5.8

EDIT: and remember, old leaves are yesterdays news, they won't lose their spots. keep your eye on new growth.

and yea man, I would not even try to grow w/out a good ph pen. check the solution every day, it drifts!