Hi! savetheearth matches most of your preferences, and I know that our Neloth would be especially thrilled to see Miraak.

It's a very backtag-friendly game, AU wrapped up in memory loss. There's a strong emphasis on overarching plot, with heavy room for players to move things along and even affect the setting. I play a villain there myself, too! Negative CR is common and in my experience, players are generally willing to work with you on it.

On the other hand, network activities make up a solid chunk of what happens, though face-to-face logs are still very common. It's very much on the faster end, as well.