My comic is Runewriters, it's fantasy, with spells that didn't go quite right, a questionable secret cult, and the occasional lovecraftian-lookin' monster, and it takes about 1-2 hours to catch up on the archive!
I'd also highly recommend Sanity Circus, it's the urban-magic-with-just-a-tiny-dash-of-horror category with shapeshifters, phobia-based monsters, and sentient instruments, and it's one of my favourites! (tho it does have a bit of a longer archive).
Aetherwing is only about a year old so it's got a pretty quick archive! There's a cranky angel and a shy magical nerd attempting to solve a magical mystery.
I don't think I saw any of these in your reading list already so hopefully there's somethin you enjoy! : D