Several Problems! Please help? *Pictures

Alien OG (x9)

Canna Coco medium (pythy), temps kept between 77-80. Clones, height ranging between 23 cm (9in) and 14cm (5.5in)

400w Metal Halide for 18/6. Hand watering. distance is 31 cm/12 inches from light to plants

The smallest (14cm) has slight nute burn on tip of biggest top leaf. The bottom leaves also exhibit yellow outer leaves with greener veins.

Two other plants exhibit abnormal 'twisting' from a pH watering that was slightly high, (6.5ish) Other plants seemed to be doing fine

Nutes: 12mL per gal. Using CNS17 grow for coco, 3-2-2.

Watered on opening ceremony, repotting to 3.5 gal buckets with ample drainage. Watered till slight run off.
4 days later light misting on plant in fear of over watering. Might have been a bad idea to foliage mist.
Let the coco dry in the top 2 inches and soaked today. After watering with pH between 5.5-6 another plant is exhibiting an intense curl.
There was a fungus gnat problem, so I bought "Ecosmart organic insecticide" containing peppermint oil, cinnamon oil, sesame oil, winter green oil, water, 2-propanol, canola oil, lecithins and nitrogen. Some of this got on the foliage, would this cause the brown spotting on the leaves? I thought wiping the leaves off would prevent any damage. So out of fear I decided to try potato slices and yellow paper with Vaseline on it, you can probably see that in the pictures.

So can someone help diagnose the yellowing, burnt tip of one plant: is that nute burn or nitrogen deficiency? Again I let the canna coco dry out on the top two inches before watering today.

What about the intense curling on two plants? One a different plant it looks like there's destruction of plant mass. No insects have been found other than the fungus gnats, which population has decreased dramatically.

Please help, much respect and love to go around..
 

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