I guess it really depends on how close you are to your target. If you're point-blank (2000 yards or closer, say), it's probably safer to just hightail it out of there while ducking beneath the layer after your first salvo, since your torpedo will probably have already hit by the time you're 90 degrees through your turn. Farther out (say, 4000 yards or so), you'll probably have enough time to set your second salvo to Fast and have it hit by the time your first salvo reaches their targets, and the direction of turn doesn't matter a whole lot (plus, it's unlikely that escort sonar will pick you up that far out if you're at least early war depending on what mods you have installed).
In much of my experience though (at least with RFB1.4), you won't always have enough time to put a second salvo into your targets unless you're at some intermediate range (or if your target happens to be anchored). At far ranges your second salvo, if set to Fast, might not have the fuel to make it to your targets, and at closer ranges your first salvo might take out their targets before you even have a good solution for your stern tubes.
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