Hey dude. Definitely feel like the pitting and twisting or your leaves is a heat issue. I suggest dropping down to 25-26 and see how they feel about it. Also, I know your lamp is at 30cm, but these little ones may not be taking it well and may need to slowing back off. Another quick move would be to jump your 21/3 cycle to an 18/6. It'll give em that extra long break they seem to be wanting for ATM.
Definitely a non issue, just environmental parameters, transpiration is out of wack and some stress. Couple tweaks and I feel you'll be back on track👍
Cheers and good luck no matter your course of action 👌