Ok, you are getting closer. Ignore the cranks in the small pen and leave them there. They will not hold a grudge.
Put a little treat just a little way away from where they are all huddled. And move away, do not make them go to it. This exploration has to be at their pace. You might lean something up in the corner so that they are behind it.
Basically leave them alone until they get brave enough to venture forth, that will give them confidence in this set up.
I might leave the big girls completely in that enclosure for a several days, when I did let them out, it would be a bit before dark, everything should shortly go to roost, and I think you will be good.
Do put up the mini walls ASAP, so they figure it out.