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My aero eyeball says that the angle [12deg] in the picture is to great. although most people on this website us 10 deg as the bench mark I use the slope of 1 in 6 which is about 9.5 deg. you need to keep in mind that this is the maximum slope! So if you are at 12deg. then it is too steep. An other consideration is the lenght to width ratio of the object [car] the drag decreases as the ratio aproches 7 to 1 then increases as the object gets longer. I agree with those who have said that longer is better, and if you reduce the slope to something like 5 or 6 deg and then clear the open trunk, you may find some improvement. When in doubt keep testing...
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