I use different torpspeeds to avoid zigzags, thus increasing my chances of hits where I want them on the ship (difference between using one or more fish).
First: pick 2 targets you can hit from current position and AOB
Then:
First fish: slow speed, farthest target
Second fish: fast speed, closest target
The second fish makes up time to the first, so both hits should be almost simultaneous, or at least close enough together in time so neither target has enough time to start zigging out of the way.
I find the TII (no visible trail) only useful in my stern tubes, to catch a pursueing DD on my tail with a magnetic shot, without him seeing the trail and evading.
BUT: you can also use the TI, risk him evading and thus wasting a fish, but also a very good chance that, due to his evasion, he won't find you again.
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