i have never got the ph correct nute line,doesnt seem possible to me,just saying provider sales the stuff like a magic bullet and there test are done in a controlled area and gadgets,if you dont have or cant afford the same stuff and grow the same way,how can they stand behind it? anyway like aqua said to high, hell soil would have issues with that ph too trying to buffer it,got one more question for you cheuy are you adding silica ?if you are ,are you adding it first and letting it stabilize? that bring on ph issue too,mix it first then wait a hour,check ph then add your ppm to get what you feed,the silica will cause for less feed,then ph water to were you need it and use the ph down