Thierry,
The incident for the 8Jul41 is on
www.allaces.ru which came from D. Khazanov's book about the Su-2. It lists there that Lt Alekandr Petrovich Devevitskiy was the pilot but it lists on that site that he didn't return from a mission on 13Jul41. Which could mean that he evaded and returned to duty. Heinz Baer of the 1./JG51 is listed in JFV 6/I as the pilot shooting down a SB-2 at 19:35 but no location. It seems that III/JG51 was at Bobruisk-south and I/JG51 at Bobruisk-north. III/JG51 seems to have shot down DB-3 at 19:15 & 19:25. In the clash Sergey Popov was credited with shooting down a Bf 109 but the only loss of a Bf 109 was further north a Borisov. I found no date of loss for Derevitskiy out side of ??Jul41. The base for the 103 BBAP was Novozybkov.