After much debugging, I've found that if I include fonts that have more weights that are classified outside of Regular and Bold, it defaults to the most bold version of that font. Thus Helvetica Nueue becomes Helvetica Nueue Black. I have noticed this on a few other fonts.I was going to use .fonts.conf to fix this but Googling/searching here has not suggested that's possible? Thanks in advance.
Font weights appearing bold
ubuntu;fonts;fontconfig