Before you go to the sail panel, try adding a partition wall under the half-tonneau. It should help.
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Might even try tailgate down with a sheet of plywood extending back and tilted up at front (and down at back).
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If your talking about from the top of the bed to the end of the tailgate, the angle is too steep. It shouldn't exceed 12°, so not 45°.
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...another way to get a smoother surface...
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A vinyl wrap? Plastidip S?