I usually use impacts at close range. I set up from the TDC screen rather than the peri. Seems like cheating a bit tho. I lock on and just look at the run time to target and angle of torpedo impact. If you are a ways ahead of the target and perpendicular to his original course, you can judge the time it takes for him to make the course changes and how far off the centerline he is straying.
Then i try to judge when I would be getting close to a 90 deg impact after the run time. This is based on which way he is zig-zagging, it can be either side of 0 deg. Quickly switch to periscope, adjust for sweet spot and fire.
After a couple of times it gets pretty easy and reliable.
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