Hellraiser
Arcane
Why do you need fuel lines at all?
I sent a ship to the Mun with 1 engine and ~17 tons of fuel, your Mjodhorn uses 3 engines which require more fuel, but no fuel lines.
Asparagus staging, it's more efficient as you ditch the dry mass of the side-mounted tanks and engines sooner. So more energy goes into propelling your craft rather than on getting a part you want to jettison up as the average fuel/total mass ratio during ascent increases.
The disadvantage would be in increased atmospheric drag, but Kerbal's atmospheric model is still a gross oversimplification of things so efficiency of asparagus staging isn't hampered much. That and if you're using side-mounted tanks (rather than top mounted ones) you're still going to get drag.
Unless I misunderstood the question.