It is a fairly reasonable impending Doom that tips the Balance of the space Battle in the Empires favor.

But it does not feel like the ticking time bomb and it's not played off against the attack run.

Perhaps if the Death star kept Shooting down a few more capital ships whilst they were trying to destroy it that would go some way to fixing the lack of tension of what was causing them to potentially lose the battle.

In this case the Executor should probably fall away and break apart not hitting the death star