Honestly it look like a ph issue...your showing def in K and Fe for sure and possibly Ca which wouldn't make since some you've added fert...I don't see nute burn here but maybe some what high N which is common in MG and most wide variety ferts.
Personally I'd flush your soil with what ever fert free water you were using hopefully not RO water. Secondly I would start misting the plant with something low Potassium correct K def, which you will see results in as little as 10hrs! (I use potassium sulfate when I can, worm tea, or kelp tea) Fe is more diff...takes 10 days to see correction results! So be patient, and any of the above suggestions will correct it!
Hope that helps ya bud