Hi @LindsayBrinkman.,
I *think* what I described does what you want, though I'm slightly unsure.
Here is the setup in the build area:

And in preview mode, it ends up:

When you select to shuffle the questions for the quiz, it'll shuffle the stimulus blocks themselves here (which is why stimulus 2 is appearing ahead of stimulus 1 in the preview). The randomization of the individual questions in the stimulus blocks comes from the drawing from an item bank (I don't think the questions can be randomizes within a stimulus block unless they come from a bank).
Does this clarify a bit and match what you wanted to do.
-Chris