I have used that font you are using in my endless search for a decent font. I just couldn't use it long term, however, because of problems with bold and other issues.
I have been using Dina. http://www.donationcoder.com/Software/Jibz/Dina/
It is a FON file as well, but much better designed. Give it a try and see if it fixes your issue.
Another person has converted it to true type font, but I haven't tested it yet. http://www.geenat.com/?p=66
EDIT: Just tested the True Type. I'm sorely disappointed.
I have also sent an email to IDM requesting the configuration option to turn off bold for brace highlighting. As a matter of fact, I requested they give us the full option of "normal, bold, italic, underline". You know some people are going to want to go there.