Good morning, Joe - good to "see" you on here again.
Have you checked with the archives at Freiberg? If not, I can send you the information to do so.
Also, just for quick information and nothing too in-depth, you can try
http://users.accesscomm.ca/magnusfamily/ww2ger.htm for the standard info.
A quick use of the CTRL-F feature and typing in your last name comes up with
PeterbursHansLuftwaffe18SKG210 & 10, SG4; KIA 11/Jan/1944
The 18 naturally being the kills - but only for Hans, and not for Heinrich.
I understand the difficulty all too well researching family members; my maiden name was as popular as "Smith" back then.