Only one pic is hard but I would guess toxic salt build up not a deficiency. Gronnh20 N-P-K is complete fertilizer for short cycle resin producing plants.

The trick is to give the plant the correct amount of nutrients at the proper stage in the cycle. His plant is to old for 1/2 strength nutrients, he is in the veg cycle not seedling. If you are only using 1/2 strength then you are shorting your plants a lot.