That's the way it is supposed to be done. Making sure that your target does not hear your transient is a big first step to staying hidden until the last possible moment.
Consider launching and running your torps on the oppose side of a layer to the target if a layer is present. Using a strong duct can also be beneficial masking the noise of your fish. Get to within a couple thousands yards and then steer the torp onto the target if it does automatically acquire due to the layer. Enemy will always detect your torp at around 1,000 yards.
As you have discovered already, dog-legged approaches work well.
Don't forget about the shadow zone - can be more useful and effective than being on the opposite side of a layer for stealth. Here you can hide from surface ships and subs at the same time.
Of course the slower you go the less noise you make. All quiet is a misnomer it is effectively as quiet as you can get without coming to a full stop which is as quiet as you can get.
Running your torps deep when targeting ships at depths of 800 feet or more (depending on the era you are playing) also helps.
Lots of little surprises to learn as you try different things in a different order under different circumstances.
Literally, every decision you make and every action you take has some effect on the possible outcome of any encounter.
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