Flushing help! Alein OG

Alien OG (x9)

Canna Coco medium (pythy), temps kept between 77-80, humidity 40-45%. Clones, 23 cm (9in) and 14cm (5.5in)

400w Metal Halide for 18/6. Hand watering. using CNS17 Grow 3-2-2 for cocoa/soil

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. Slightly high.

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.

Letting coco dry out before performing a flush with bush doctors sledge hammer from Fox Farms tomorrow. Plants seem to need a water tomorrow, the buckets feel light and most of the cocoa is dry 5cm in (2 in). I was going to perform a flush tomorrow.
I also just took care of a gnat problem with a spray comprised of Peppermint, Cinnamon, Wintergreen, and Canola oils, with nitrogen in an aerosol can bought at home depot. Letting the coco dry out more was a stronger suggestion because they are stretching their roots into the new pot and the gnat larvae had a less chance of survival.

When should I water with nutes again after performing flush?
 
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