Thanks for the feedback! Sounds similar to what I'd had in mind; maybe it's not making as much sense as it should because I haven't played it out myself. Are you running Rain of Filth?
I am not running Rain of Filth, though it's possible I'd like it more than the Preordain. I'm not as big on how it plays with PiF, though it does seem sweet for cabal rituals/tutor chains w.r.t. threshold/additional rituals.