in rl, b-17's only flew at 20,000 to 26,000
I honestly do not know the historical accuracy of the B-17.
I do know, this game is not played as it would be if flown as was, in real life.
And I also know from experience in this game, few fighter pilots know how to even get to me above 30,000 feet. A few guys do; they are very good and their score tallys reflect this.
Off topic: As to real life and the B-29 coming into theatre. Seems to me they flew above the ack.
This is a game.