Our team had a similar problem too, and one of our mentor came up with a simple fix. We added a lip on the exit side, so only the bottom most Frisbee lay flat, the rest sits on the lip. When the bottom one exits, the diagonal length allow the second Frisbee to fall through, getting it into position. This process repeats until all Frisbees are fired. The concept is very similar to team 2073's system:
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Originally Posted by billbo911
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Our prototype showed that it works with a stacked hopper system, but we ended up using a linear shooter and loader system. Hopefully this solution will work with a curved shooter.
This concept is illustrated by the poorly made animation on the attachment.
Edit: After thinking how it worked on our robot, I realized that the animation is somewhat inaccurate. The back piece should be angled a little towards the exit so that it realistically works.