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You can see in your third picture, the image of the SW needs to be rotated slightly counterclockwise.
The template calls for that arrow to be lined up with the highest point on the roof, where the roof is flat. Then you use a sawzall behind that point to generate an ideal teardrop shape.
I propose that if your roofline is curved downward less steeply than the template and you don't want to sawzall, you can slide the template rearward until the angle of your roof matches the angle on the template. This is equivalent to lengthening the fore-body. In any case, the slope of the roof must match the slope of the template where you begin your modding. Otherwise you will have a crease running the width of your roof.
I recommend blowing up your images to a few thousand pixels wide before aligning the template.
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