Help 3 wks into grow leaves cupping

This lady has some leaves that seem to be cupping. This is my first time to grow and I am worried about her. I use soil medium, shes 32 in tall., 3 gallon pot, ff nutes and schedule, water 2x wk., ph 6.5, 450 hds, 75 degrees constant and about 35% humidity, hard to get more as live in desert. PLZ HELP!!

from the pics it seems only a few leaves are effected? i can't see it in pic and 1 and 2 and it seems minor in pic 3.

the lower and middle leaves where light and ventilation are less often do similar when the plant has had a long veg time. its hard to tell as we can't see it in person.

i don't see cupping, i see clawing. back off the ferts, imo. very dark green, also.