pests? Abnormal ph? k def? Or maybe just too much "stuff" sprayed over the leaves too often? And in coco known for its own problems.

I'd certainly stop foliar spraying your crunching leaves and adding to the problem. Then I'd start looking around for someone who works in coco because that looks like a ph/def issue (unless it's pests just attacking one part of the plant which would be even more odd) and figure out exactly what your ph should be and what it is.
Weedhound Reviewed by Weedhound on . What is my problem? 2x 600 hps Coco 4.5 weeks of flowering Feeding daily 1300ppm +-100ppm (1800microsimens) PH 5.8 Foliar spray daily Growth exel PH 5.5 300ppm (500-700 microsimens) (Last week added magnesium sulphate to the foliar spray PH was around 6.5 and 700-800ppm sparayed for couple of times then discarded) What are the possible causes of my troubles could be. Spots on the leaf and reddish stem Rating: 5