> I hated the high-pressure midterms/finals of my undergrad
The pressure was what got me to do the necessary work. Auditing classes never worked for me.
> I do some spaced-repetition questions of important topics and give students a study sheet of what to know for the quiz.
Isn't that what the lectures and homework are for?
The quizzes are still somewhat difficult (and fairly frequent) so you have to still get your stuff done (and more consistently than the cramming encouraged by a big midterm/final)
I do spaced repetition in lectures, my homeworks are typically programming problems and, as I said in OP, rely on the student committing to doing them w/o AI. So spaced repetition of the most important topics on quizzes seems reasonable. (It's an experiment this semester)