Curved leaves

You should let the plant dry out you're having these issues with the leaves drooping because the plant is being overwatered, my friend.

hey there WQ, you have root problems due to overwatering actually. So you're doing well just watering them simply, but basically the roots got contaminated with water mold. So what you want to do is break up the problem roots with humic acid, enzymes, beneficial bacteria or h202 diluted to 0.3% . Try add any of these and the plant should bounce back fully in 10 days or so. Hope this helps ! 🚀

The older burnt leaves will stay burnt and never recover, they are damaged permanently. Keep an eye on the new growth, this will indicate the current conditions. The plant seems to be very green, so I would suggest that when you resume feeding, to only use half strength of the nutrient you are using currently. Baby plants need baby feeding, so go gently with the nutrients until they have 8-12 nodes. Hope this helps,......... Organoman.