No info about that mission, only the . But... I am sure that a lot of machines were lost during these soviet air attacks which are not mentioned in the german statistics... I believe Lipfert's stories. Also, II/JG52 had 21 (!) losses in May due to enemy action, out of which only 4-5 were in late may in Romania (incl. Gerd Barkhorn's A/C...).
Source for 21 losses:
http://www.ww2.dk/oob/bestand/jagd/biijg52.html
I can check soviet side reports, maybe I find something about that day.