We have said this before but worth another mention. Regarding the number of kills- there is a huge amount of variables at play from date of combat, craft types, enemy craft, skill of those squads you meet in that region at that time etc, personal game settings, personal aids, radar, trackir or not. the fact that you all mostly have 100's or many 1000's of hours of virtual flying 100's of deaths probably (very unlike some pilots in WW1 of course) etc. However also in all this one thing is not present in any sim, the absolute real fear of dying. One real life at stake, one chance.
This alone would make real fliers much much more cautious, break off at the slightest danger. So to make the kill "numbers" absolutely real even if we had absolutely human-perfect AI, YOU the player will still take more risks than real life. Even if you play cautiously, I'll bet you occasionally neglect to look behind or take more bullet hits from a 2 seater than you should as you try for that kill, or maybe cannot be bothered to dodge weave etc in flak or when behind the 2 seater. I mentioned before as a joke if we made the sim format your C: drive if you died once it might give you a small taste of fear and help the kill numbers