Hahaha... I have the same problem with comy! If you noticed, I hardly name the zoas when I post the photos. Just add a smiley face, attach the photo and post!
Just to share, I used to struggle with zoas not doing well and not opening up nicely, but I've learnt to slow down and not shift them too much. As things start to stabilize, the zoas not only open up well but you can see physical growth. Of course, there will be some zoas that may melt in-spite-of good water perimeters, but that is an entirely different case. I would say slow down from doing too much to your tank and let things run on its own. Continue to keep up with the weekly water changes and maintain good water perimeters, but most importantly, wait patiently for things to stabilize before adding new things.
You could also try to dip the zoas in Lugol's solution or Coral RX in case they are indeed affected by diseases or harassed by pests.