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I know it is not the "popular" thing to say here, but, I don't think the template is the thing to follow. I think a modest 7° or 8° overall slope would be a sweet spot on something with slab sides and sharp corners. Reason being that if it slopes and creates a pressure drop, the air on the sides will rush up to fill that in, which creates a huge swirling motion....you know, a vortex. If you give generous radius's on the corners and angle the sides in, you can then slope steeper. You might make it as you are and do some coast down testing for a baseline, then start adding height to the back by making a panel supported by sides that raise overall angle from 12° to 8° which would be about a 6" higher back giving you a total drop of 6" or so instead of 12". I really think that would work better.
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