Im all for making snipers move more, but having a gun better than the lumber jack and the heavy flak in many ways is really problematic.
I would definetly want the new medium gun to have impact damage. And i do support how this could be used. But if anything, ide give this weapon a very bad vertical aim, but very wide horizontal aim.
Forcing the ship to be on the same level as the other ships.
And a Wide AOE. So that if it hits, it has a chance to also hit a neighboring ship. Or yourself if point blank.
With these adjustments you can make the torpedo go much quicker (much quicker), but add in one more nerf. People are able to destroy the torpedo mid flight (Enemies can destroy it that is).