Hello,
I was searching something else, but found today a very interesting Soviet blog giving Soviet, Finnish and German data about air battles on the Artic front. There is no details of WNr and so on, but still a good detail level.
It is in Russian but it is readable with translation robots.
The URL:
http://cyclolife.livejournal.com/
Although the primary subject of the blog was biking and other sport, it includes also a number of posts about air battles in Winter War and from January to May 1944.