Hello
Did you add any initial nutrients into your coco? I know many will add a small dose of calmag in the beginning.
I see 2 leaves have very minimal cupping where the leaf tips are curving upward...i think you may just be dealing with the intensity of the light from your grow and finding the sweet spot. Now that you're having a good distance maybe just give the plants a little time to get comfortable. You can also look into using a silica supplement and kelp extract which can help plants fight various stresses.
*also hows the wind level in the room? Sometimes high wind can cause curling and twisting.
Happy growing.