I think your issue may have been the low ph......is one of those ph numbers you're posting there the actual ph runoff? If so...which one?

How long has the plant been in the same soil and/or pot? I've discovered the joys of transplanting into fresh soil which seems to solve so many problems for my soil plants that it almost brings a tear of joy to my eye.......

Whats the ppm of of your runoff as well?