Hi RodW,
   Correct me if I am wrong. if you wish to adjust the header2.inc, the "box" and the linespacing are in the top of the header2.inc. Below are some of the code:
 vi header2.inc
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               $this->row = $this->pageHeight - $this->topMargin;
        $upper = $this->row - 2 * $this->lineHeight;
        $lower = $this->bottomMargin + 8 * $this->lineHeight;
        $iline1 = $upper - 7.5 * $this->lineHeight;
        $iline2 = $iline1 - 8 * $this->lineHeight;
        $iline3 = $iline2 - 1.5 * $this->lineHeight;
        $iline4 = $iline3 - 1.5 * $this->lineHeight;
        $iline5 = $iline4 - 3 * $this->lineHeight;
        $iline6 = $iline5 - 1.5 * $this->lineHeight;
        $iline7 = $lower;
        $right = $this->pageWidth - $this->rightMargin;
        $width = ($right - $this->leftMargin) / 5;
        $icol = $this->pageWidth / 2;
        $ccol = $this->cols[0] + 4;
               .
              .
              .
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   Your address line height is fall in the  $iline1 (line 28). You should adjust at the TOP of the $iline1 but don't go directly to the // address1 (line 150) and change the lineHeight. I am not sure I understand your question clearly but I do change the TOP variable and it reflect in the Reports. You can change the reports according to need. Hope it help.
 Cheers,
 tclim