Alright, lets use the minekaze as the example, it comes with stock torpedos that have a range of 7km, and the "upgraded" ones that have a range of 10km but only travel at 57 knots, 11 knots slower than the stock ones
Thats that a great idea, but of course all the torpedo launchers would be managed at the same time and you would have to wait for the torpedo reload time.