Cleaning up body lines

So, I'm doing a Dart for a guy now. The quarters were put on before it showed up here. The paasenger side was a mess and took a lot to get the body line to look right. What i wound up doing was getting the quarter all straight then, ran 2 tape lines, the first one right above where the body line would flatten out and, the 2nd right below where it should flatten out so, basically between the lines was only about 1/2". I filled the area between the tape lines to make a more pronounced line. I sanded this down until the hieghth of the line seemed right. I then ran a tape line to what would be the very center of the line and blended the bottom in then, retaped the center of the line and blended the top in. Turned out pretty decent but, took hours to get it there. If you can see it in the picture...

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