Tartarus is actually perfect where it is in my eyes at least in T4/T5 eyes. It's a nuke that does 2000 dmg (destroys fighters, interceptors, pods, and etc..unless armour pulsed, and it does:
Stasis, 125 energy drained, and Module silence for 12-15s.
You can kill a dreadnought easy with focus fire in 15s and no energy/very little parry it's just coordination. This nuke is to apply a timing push, or stall a rotation. You can use it to follow up with your initiating dreadnought whose going broad side to broad side with a dreadnought. You can use it to assure your seondary module (Vultures/Light missiles), will land a direct hit -- thats 20k damage.
The aim of tartarus is to put utility preasure on enemies. It's not meant to essentially kill - but put opponenets in positions that either stall, or exposes weaknesses in positions that make them vulnerable to kill. But a 55s nuke is definitely sufficient.
"A good soldier obeys without question. A good officer commands without doubt."