I think there might be an issue with the torpedo speed selection.
I'm trying the "torpedo the dreadnought mission" , selecting "optimize torpedo propulsion" to get 14km, 52kts torps.
Then in the constructor, select "fast" torpedo propulsion, expecting to get 7km, 68ish knots torps (what ? i like fast ^^), but the stats in the ship details stay the same, and ingame, the torps still travel waaaay over 7km (harder to judge speed though)
Has that one already been reported ?