Hi All, @Werner Lemberg Thanks for the info. My next step will be to go through the FontConfig bug list and source.
@Peter Grandi Unfortunately (for... <cough>... reasons), it's not an option to change the font in the application, and the font must render exactly the same, pixel-perfect. I ended up embedding a bitmap version of the 20Pt font in LiberationMono-Regular.ttf. Took two days to figure out that workaround, having never had to deal with a font in my life. It's certainly been a deep-dive. Again, thanks everyone for your time. Should I end up with answers, I'll be sure to report back. Cheers, Ben