Well, I just checked my stats this tour. I have 5 kills in the Il2, all vehicles. I have one death from being main-gunned by a tank. My 1 kill of a WW thus to far was in an Il2. I have taken the turret of several others and received assists when they were killed with by someone else. This is also the case with tanks, I have probably more assists on tanks I rendered helpless through turreting/tracking than outright kills. And, it must be emphasized I am a terrible shot.
I stand by my conclusions that when their is an air-fight going on, the enemy fighters just can't or won't dive to the deck to turnfight an NOE Il2 long enough to get the kill when other friendly fighters are present. I will track these stats further and use the A-20 instead of the Il2 for defense when FHs are down to avoid muddying the statistical waters.