PHP-based ImageMagick and Freetype Expertise Needed

I have a back-end PHP script that generates a text image with some graphic elements positioned at specified locations around the text. Through the interface, users can select different fonts, sizes, graphics, and placements for where the graphics will go. The problem that I need to solve is getting some consistency for the placement of these graphics. With some fonts, the placement of the graphics is just right, but with other fonts, the placement is a little off. I need the graphics to be consistently positioned correctly, regardless of the font. As the Job Title shows, fixing this problem will require some experience or aptitude with PHP, Freetype, and ImageMagick. **The code is accessible through SVN only.**