sorry, I should say that I'm searching now since two years about this families and I know GGD. I also bought all familybooks from Manfred Daum, which are relevant for my research, but there is a missing link between my persons and the persons with these surnames in the books.
The old churchbooks looks like lost and the last idea I have is to ask around in the www to find descendants of these families which have more informations and can help to connect to the wellknowen families.
I know the names of the first German settlers in Galicia. I also know a lot about the families (From the familybooks) but it is impossible for me to connect.
They had always a lot of children (10 - 15) and always used the same names. It's crazy.
So I also know that some people remained in Galicia and some emigrated to USA I hope a few do also familyresearch and get knowledge about my search and contact me.