That's a beautiful bush man. Keep the large fan leaves tucked under the lower cola tops and they will stretch and grow much faster. Also helps create more bud sites on them.
Under LED your plants will need the cal mag at this point big time.
What cal/mag sup do you use? If it has no nitrogen I would reccomend at least 1ml per liter at this point maybe even 1.5 a little extra won't hurt them