blackswan40... Thanks for the link; appreciate it.
Niumi... I see what you mean now. Regarding my 4 Sunderlands reference, it's been even more severe on a number of occasions where there'd be literally
up to a dozen Sunderlands and/or one of the other heavies circling my position. After crashdiving & going back up to periscope depth, I could see all their icons up there on the overhead map, or I'd just repeatedly press the period key & count them. Some would leave while others filled their place. When they finally cleared away, I'd get another aircraft sighting within the hour or half hour. Crazy.
Actually, from my perspective, no spawning of aircraft over 512 time compression sounds like a godsend.