Starving or PH lockout issues?

[Centrum]

Pure coco, also have some coco perlite promix combos.
All showing the same symptoms.
2 PH pens i had where broke, where totally off!!

Weird thing is brand new pen is calibrated Im using RO and the water from my Dehumidifier. Its measuring 6.0 PH ( I always thought it should be 7.0?)


I Mixed 650 PPMS of Dyngro grow the PH was 3.6 !!!!!!

I stabilized it to 5.9 - 6.0.

So anyways the plants in these pictures are from weeks of who the fuck knows what the PH was.

I took some measurements of the run off, its right on with whats going in. 6.0ph.

Is this PH issues or is this something else ?

 

[UberPooner]

nute burn. 650ppm is pretty high for these plants especially the one in dixi cup. I have much larger plants in RW and they are getting burnt at like 300-400.