You need to set up a kerning assistance file in FOG.

This may solve your problems: http://www.typotheque.com/type_utilities/

Check out the Accent Kern Maker

You can get FOG to do this all for you using Metrics
Assistance. Just set the base character ("a" for instance);
choose "Left" and "Right" (or "Width") under
"Characteristics"; type in your characters under "Apply to
these characters" ("

Thank you a million Mark Simonson, just what I was looking for!