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Overlay a side-view pic of your setup with the aero template and see to it that your Bonneville spoiler (with or without endplates) extends to meet the template line.
The Bonne spoiler is similar to pickup truck aero with a tonneau in that they both more or less conform to the aero template but not with a continuous surface; rather, that part that falls away from the template (on a pickup, over the box; on a sedan or coupe, behind the rear window and over the trunk) sort of "contains" a rolling wave of air which is not as draggy as the turbulent wake which follows those shapes when they don't conform to the template profile.
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