That's with very close to optimal engineering on the FSD and the sensors, running with half sized tanks and one SRV each. The notable results:
Asp X: 57.36 lys max range, 55.49 lys full tank, 0.18s fuel scoop rate
DBX: 60.00 lys max range, 57.93 lys full tank, 0.46s fuel scoop rate!!!!
That scoop rate still hurts even with half tanks, BUT for traveling speed purposes the extra range of the DBX just might make that time up in distance per hour. Testing will prove that out, but I'm wagering it won't be as bad a downside as it seems in the end.
I'm a bit confused about that scoop rate, is that time per tonne? If so, it's odd it's not the other way around, tonnes per second.
Either way, the other benefit of reduced weight / greater jump range is fuel economy. You can add some virtual tonnage using the cargo slider and then plot routes with the same jump range as before but greatly reduced fuel usage.