The plant looks like an Indica hybrid. Some Indica strains need less light or a lower powered LED light. Maybe try a light with half the power and see if the plants do better or tried giving them some rest and some darkness.
Hello there Lazuli,
is the humidity too high in the grow room? RH should be 60% during vegetative (70% for clones) and 40% during flowering.
Good luck with your project, I wish you all the best!