I don't think discussion questions are a huge problem with spoilers, especially if they're not posed until we open the discussion. And the one thing we've learned fairly conclusively is that the discussion should NOT be opened until some fixed date after the voting. Opening it immediately after the voting didn't work out well.
Another thing that's been suggested that I think deserves further consideration is leapfrogging -- voting in January for March discussions, February for April discussions, etc.
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