Hi Don
What you show in your PDF is the correct way ArchiCAD handles composites. Only composite cores (& skins) with the same fill will heal together. Or more accurately, composite fills with the samd ID will heal, and the cores take preference. The thickness is irrelavant. If you want all these walls to heal, you will need to apply the same fill to the composites. Instead of having '2x6' and '2x4' fills, you could create a fill called 'Wood Studs' and apply this as a fill to all the composites. In fact, in this case, you wouldn't absolutely need to use composites, if you didn't want to, although I would still recommend it.
I hope that helps you. Keep us posted.
Cheers,
Link.