Pthisis, you have to understand that the ship was designed before the codex, when the philosophy of SM ships became 'punch through to the planet and deploy SMs as quickly as possible'
Before that SM fleets were actually warfleets, designed to fight extended engagements.
The Powers of Chaos document is... well... rubbish.... The powers are better suited for a more supernatural fleet like Daemons (which is how they are applied here).
Notice how the hull pattern actually affects the speed of the vessels, the Terminus Est is still 20cm speed, ships which have the Desolator pattern hull have 25cm.
With that there is reason to add a fast carrier. I didn't put in a Wage of Sin type ship, but I think there is fair enough demand to put it in. RC likes the idea (I think?), and this would give you your battlebarge.