Yhea... Personally I consider the best to have PB using PM areas since PB is, after all, an add on for ProMods!
How it currently stands, in a few versions, overwritten sectors will keep increasing in number, and people might start to not include PB in their load order...
Working for me too, ETS 2 v.1.28.x+ProMods 2.18+RusMap 1.7.4+Project Balkans 2.5+Southern Region 6.5.2+The Great Steppe 1.02+Paris RB 2.1
Yesterday I was in Balkan zone. Perfect roads.