The flatter angle would give you slightly better rear visability. The Kamm you have now reduces rear wake, but maybe at the cost of more lift. It probably breaks even, so it's not a big deal.
You can also try to extend back another few centimeters to the end of the bumper.
If you had the time and place you could test 2 different angles, depending on where you place the template.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
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[Old] Piwoslaw's Peugeot 307sw modding thread
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