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You shouldn't need to go quite that high on infill. On top cover, where it touches the table when open, there are two rectangular cutouts. Those are actually meant to be for an adapter that extends out to help it balance. I never ended up getting around to making one, but it shouldn't be too hard to make one that fits. The other option is to attach thin weights to the lower half of the case, near the back. That would probably help to keep it down.