when leaves curl or tip up like that its usually an issue with overwatering/root problems, heat/light stress, extreme humidity levels or a combination of these factors.
Your plant don't seem overwatered and 60% RH is not extreme so leaves me to think that they are stressed from heat/lights. increase you air exchange and ventilation and raise those 600 watt LEDs some. Damaged leaves won't heal and get any better so monitor new growth. Hope this helps. Cheers