The 'Lame' encoder in dbpoweramp advises VBR...which will utilise 320 for complex passages, a lesser rate for less complex. The 'quoted' VBR of 190 is just an estimate...
https://www.dbpoweramp.com/Help/dMC/mp3lame.html
...as you say it's perfectly good for my car, whilst I use the original FLAC versions in my Hi-Fi, and phone...