Nothing found here either as far as confirmed victories, see link.
http://users.accesscomm.ca/magnusfamily/ww2ger.htm Let us know if anything is found by you Sylvester?
I also looked at Kacha's page
http://www.luftwaffe.cz/ and zip there. perhaps since at the time, Lange was a Messerschmitt factory test pilot... none of his claims were submitted? seems he would like to be awarded the Iron Cross for these though?
Perhaps a member that knows of his service with 1./KG 51 may know a little more about this Pilot, Or a member with a list of the Iron cross winners???? Or? Does it smell of another Dulias?
Perhaps these were never submitted for claims?
Kevin