I study a little that torpedo...
first you must learn range/speed
means, your own speed, the target distance, the torpedo speed, the target possibly path during torpedo trajectory...
with all that in mind i found nealy a death path to any capital ship at the right point...
i trained a lot in sp in a lost hostile system, just build a station and wait for reds to comes around...
build another station another lost friendly/moderate system not so far and play "attack of the red station", alone, traying speed, angles, missiles, guns, and so on
the fulcrum one is really tricky at first, i get often blown by my own missile

then sometimes i shot 3 of them and killed no one, because they move, i move, the torpedo move and... no one get injured in that useless blast
but, when you train you find, and it's possible to be very destructive and safe with that missile... speed is very important, thinking about relative speed of each elements... i guess and target is dead whatever it is