There have been plenty of times where all 6 missed or 1 ship got tubbed. Some players argue that the kami should be turned off as an easy Axis nerf against their advantage, especially in G41 and G42.
I’d opine that the best effect of the kami is to keep them in your pocket to deter USA attacks, since they are less effective in most actual situations (killing 0-1 ships) than they potentially could be (causing USA to decline to attack because you still have them and he can’t be certain he’ll make odds).