The difficulty of balance comes with the difficulty of trying to deal with that bomber. When Piranhas attack, you can see them coming and swivel your shields, get out of the way, hit them with mass flak, etc. When Daggers attack, you can intercept them, shoot capital-class weapons at the reapers, get out of the way, soak them on your shield, etc. Tridents go much the same way.
Bombers are designed, in this game, to be things that can be defeated with perception, appropriate tactics, and planning. Your bomber, on the other hand, has no adequate countermeasures. It's too fast to dodge or shoot down, the bomb can't be shot down, etc. The only option is to soak it on shields, and if the ship doesn't have shields it's just ***.