I'm still working on Manilla Raid and Resupply, so I've been observing the behavior of one Fubuki over and over. The group is one Hiryu, two cruisers, and I eliminated all but one escort. Manila Bay is shallow, the spot I attack from is 120 feet deep, so there's no going deep to evade. Got three wrecks screaming the breakup sounds of tortured metal all around, but I put the scope down and switch to external view to watch - I go north, south, west, or settle on the bottom, kick out decoys, nothing changes. He makes a beeline for me every time. I changed his path to put him 4000 yards away from the group, he still knows exactly where I am and where I'm going. Changed him from Veteran to Competent, there's STILL no evading him.
I know a lot of tricks to fool ASW operators, but I have to change him to Novice and place him way outside sonar detection range when I start the attack to get an even chance of actually evading this poltergeist. Periscope exposure and noise are irrelevant, the AI cheats.