Hello Juha,
you're welcome.
Another interesting candidate for the top ten is Vladimir Bobrov.
Tomas Polak gives him 13 kills in the Spanish Civil War and 30 kills in the Great Patriotic War. According to George Mellinger these were only his individual kills and there were 4 additional shared kills in Spain and 20 in WW2.
Therefore, that list might to be incomplete
http://soviet-aces-1936-53.ru/abc/b/bobrov.htm
with a minimum P-39 total of 17,83 and a maximum P-39 total of 37,33.
Who knows more about this issue ?
Michael