Does anyone know why the leaves fold?

Coco mix looks very dry Too much sucking dirt.. Coco can't be overwatered so keep up the moisture.

More nitrogetn needed. I wouldn't worry about the perky leaves. If VPD is too high, maybe more RH would help. As far as the light -- watch the development of stem between growth nodes.. not too tight, not too stretchy and it's the "right" amount of light. Looks fine to me, so far.