Brandon, you are asking for information that is complex and very difficult to obtain. No offense, but this kind of work does not come for free.You need a professional researcher in Ukraine, who has ready access to archives in Rivne, Lutsk, Lviv, Kyiv andCherkassy.Some of the work might even require PRIVACY RELEASES, for no other reason than the RAHS (district level) hold on to records that should have been transferred to archives and are not, because they help w/creating income for the local govt.
Consider using your family reunion as a fundraiser and then hire qualified researchers, because YOU WILL NEED SEVERAL.Best time of the yr to get this kind of thing done is late fall and winter. August is govt holiday time in Ukraine and for example, Lviv Historical and State Archives shut down for the entire month of August.
Sorry to say, I do not think you will find answers to your specific questions in these forums, especially in time for your family reunion in September.