Hi Kickswitch,
If I reel in my TA before firing, and don't have the target on the other sonars, I'm basically assuming the solution is
good enough for a couple of minutes to put the torps in the right spot and then
their seekers can take over for the kill.
So, I think there's a degree of speculation in it, but I think there is speculation for just about every shot (sonar washes out due to ownship evasion speed, target evades, torps 'block out' the target's noise on sonar, etc.)
I've not heard how to put a TA track onto another sonar (so you can reel in the TA) - not sure it can be done??
Just my 2c - happy to be corrected

Stew