I have two out of my seven in lock down that I have not seen wiggle. I feel you stress! It is comforting to see some movement.
Just have to be patient. These little guys work in bursts, and rest in between. I am not expert, but it seems they put a big effort into getting into position, then rest. Then a big effort to pip, then rest. While resting then they need to absorb the shell contents, yolk etc, so the rest can be long here. The a push to zip, short rest and out the plop. They look weak, and suddenly have a heap of space to move. They adapt very quickly though.
To us it looks like almost nothing, but they are going through a lot!
Just have to be patient. These little guys work in bursts, and rest in between. I am not expert, but it seems they put a big effort into getting into position, then rest. Then a big effort to pip, then rest. While resting then they need to absorb the shell contents, yolk etc, so the rest can be long here. The a push to zip, short rest and out the plop. They look weak, and suddenly have a heap of space to move. They adapt very quickly though.
To us it looks like almost nothing, but they are going through a lot!