I just ran a test, using surface duct conditions, my SW vs. 2 Han SSNs. Fired one two-torp salvoes at each, and killed both. The torps did do some decoy chasing, but managed to acquire the real target within about 1nm and in one case ignored a decoy in front of it when the target was off to the side, at side aspect. I don't think anything's broken.
Initial evasion began at about 4.5nm. Torps enabled shortly after. I did a better job with the initial resteer on the southern group, I would consider the late reaction in the north to be an error on my part:
this is the northern sub after acquisition. The torp picked him up after passing the previous decoy, ignoring the decoy just released:
Here's the southern sub. The sub manages to break the lock briefly with the nearest decoy, because the torp had to sweep over the decoy to follow the sub through the turn. But the torp snaps the sub back up immediately on the other side of the decoy:
