The most complete file in entire collection is there -
http://www.yogysoft.de/pawel/_kursk/...5-III-eisb.pdf
It contains parts of III./55 KTB as well as Flugbuch entries and other stuff, all in all quite interesting I hope. Unfortunately this is the only KTB for the period that I was able to lay my hands on.
p.
edit:
http://www.yogysoft.de/pawel/_kursk/...df/KG55-II.pdf, II./55 stuff is also there, unfortunately I've only got access to a single Flugbuch and WASt reports. I remember this was first and last one I've managed to get NVMs from WASt. Later on the access to the files was limited.