I would love to be able to connect these folks to the refugees from the Black Sea flood (Noah's Flood?) but, currently the Black Sea flood is dated at about 5,500BC. ...and that is way to early for anything your research has shown, isn't it? (Where did the Black Sea flood refugees go?)
Ryan and Pittman, in their book, Noah's Flood, suggest that they may have fled up the river valleys that empty into the Black Sea. They also suggest that irrigation farming was invented/practiced around the edges of the 'freshwater' Black Sea and that farming was spread all over Europe by these refugees when they fled up these river valleys. (Linguists add some support for this theory, by tracing 'farming' words, all over Europe, back to Anatolia).
Yes, my interest begins with Abraham, about 2,000 BC, and follows the Northern Kingdom Israelites. (The Southern Kingdom gets plenty of attention from others.) But I would like to read the book Noahs Flood one of these days...
Up the bank. :^)