Very interesting developement. Nice you could save it in the end. I would tip on A. cythera, more on general structure than anything, but it tends to have longer axials and corallites open during the day. The shape of the radials looks about right, as well, appressed cups, slightly tubular. I would rule out A. solitariensis due to the radials, that should be nariform for A. solitariensis and look cup-shaped in the photo.
Thanks for sharing these shot!