What exactly does being Saved by the Epic mean anyway? It's almost like a derogatory term, like the album is really meh, and only the epic is worth listening to, the only SAVING grace of the album. If that is the case, I would argue that DT really does not have any albums of that kind. Octavarium is the closest, but as I said before, that album is constructed around the epic, so if the epic did not turn out to be the overwhelming highlight of the album, then DT would have failed because they did not meet their intended goal.
I think epics are actually meant to be the highlight of albums. Whenever an epic does not turn out to be the highlight, I actually feel very dissatisfied. That's one of my main gripes with Haken. They generally have very good albums, but Celestial Elixir, Visions and most especially Pareidolia were all letdowns for me in terms of becoming satisfying conclusions. DT is very good at that, knowing how to create a climactic piece to end their albums. I think instead of describing DT albums as being saved by the epic, I view DT albums more as having a satisfying climax.