I have a couple of thoughts/questions:
In one of your pics above, it looks like you have a few roots poking out of the cocopod:
- The number of roots look appropriate for the plant size up above, but comparing to some other grows it’s behind where it should be for the amount of time that’s passed.
- The main thing to consider is whether or not it’s progressing day by day and growing a bit more – reviewing pics taken from the same position on different days helps to give a frame of reference.
The leaves curling in might just be from the fans blowing on them. The new growth is still coming in, albeit slowly? No signs of yellowing on the leaves from inside out or outside in?