Dark Elves are both goofy. Morathi requires Chaos corruption, but has a hard time with it because she’s the only generator of it. Sort of like Vampire corruption, except her main province wants to decrease corruption. For me to stabilize a province i need probably 3 full time, fully upgraded, public order / chaos corruption generating buildings. Her main province has a building chain that really cuts down the problems factionwide with corruption, but you need to get all the way to City level 5.
Malekith has the reverse problem. He starts out with Skaven in all three of his cities, pushing Skaven corruption, but he has no way of even stopping it until he reaches City level 3, as that’s his first access to Public Order / Uncorrupted buildings. But when i tried Malekith, i went straight from having to knock out rebel Dark Elves to the south to literally 5 doom stack Chaos invasions from the north; i never had a single turn spare to try and attack the Skaven in my starting province. So his main province is constantly trying to rebel as well.
This isn’t such a problem in the main Vortex campaign, which space things out a whole lot more. Malekith and Morathi are squashed into about a 1/3 of the space they occupied in the Vortex campaign. Lothern can cross the sea in about two turns to hit Morathi, for ex., where it probably would take them 5-6 turns in the Vortex campaign.