Lou, I have flown 50 combat missions and had 14 combats with the Huns. So, roughly every 3.5 missions. The encounters have been with very aggressive Eindeckers.
Wulfe, as far as your observer being stuck on the front gun but the rear gun is tracking, I believe in reality he is on the rear gun at that time. Or, as Fullofit pointed out but did not explain it. You have to count to 3. One thou shall count, then thou shall count to two Two thou shalt not count except when proceeding to three. Once you do that your observer is free to move. RFC rule #3.42 😎
Never approach a bull from the front, a horse from the rear or a fool from either end. BOC Member since....I can't remember!