Using a Type IXD with flakvierling turret, I found that even running at flank and turning, shootouts with bombers almost always results in damage to the boat. With multiple attacks, even if you're lucky, hull damage accumulates to the point where RTB is the only realistic option.
One of the more hair-raising moments recently: loading external torpedoes fore & aft, with engines stopped. Along comes a B-24, and in keeping with realism, I cannot dive at once!
Nasty, very nasty! 