Leave edges curling

[Revon08]

Roots look great

[TLP80905]

It looks to me like there is still too much light. Can you turn it down more?
The plants look like mine did when they got too close to light or were in hot spots.
Do you have a light meter app for your phone? Some are free and work well.

http://www.grozine.com/2014/07/18/free-grow-light-meters-apps/

[Potted]

Your leaves are tocoing or trying to protect itself from to much light and or heat or both imo

[Topshelf]

Looks like heat stress as the visible leaf symptoms,
There may be other environmental stresses which make heat stress more evident. Other words stress somewhere else will amplify a symptom like this. Other stresses will make the plant sensitive to other environmental factors.
if your sure the heat and lighting are ok still raise the lights till you find or eliminate all other factors.

my 2 cents

[Colombo]

Revon08, How are things after adjustments, should see minor changes right away! Hope all is getting better with the lady.