Leaf slightly curling up

I see yours are running pretty hot. Try to raise the humidity a bit more, or raise the lights some more, let the plant stretch up to them when it's bigger and more capable of handling the higher temps and the strong light. You can use an app called Photone to get a decent estimate of how your light is performing. Mine did the same when I ran the light on max, and the grow box was hotter. Or if you can somehow drop the temps down, that could also work.