I bit the bullet and switched my paladin to Kyrian. I didn't really want to, but I'm parsing so low that's it's probably best to follow the theorycraft exactly until I figure out and fix whatever the issue is. I do have an alt rogue which I will put in Night Fae.
Divine Toll is really, really powerful. Even on Retribution and Protection it's pretty insane. Full Holy power and large amounts of damage to start the fight. I tanked a Spires of Ascension +4 after I switched, and it was pretty awesome. Multiple shields bouncing everywhere on pretty much every other pull. Though I did accidentally pull one extra pack with it before the third boss.
It is a bit interesting what carried over from the previous covenant. Neutral adventurers like Meatball and Croman come over with their same level. Covenant adventurers that you've previously rescued in Torghast can be found in the central Torghast area, though they start at level 1. You can use armor from your previous covenant, but you can't use the transmog. You can't use the previous covenant mounts, though. You do keep your conduits and their levels, but you have to unlock the soulbinds again as you gain renown. Otherwise, you pretty much start from scratch.
Oh well, I do like the Kyrian plate armor, mount and classical Greek aesthetics. Let's hope the story is interesting.