You do not want to recompress an MP3 to a different bitrate. Compressing it to MP3 the first time is going to lose a certain amount of quality, though if done properly, should be largely unnoticable. However, if you then recompress it again, you're going to be suffering.
Also, you don't want to be using ANY fixed bit rate (320, 192, or otherwise). You want to use VBR (variable bit rate), where the bitrate is constantly changing throughout the song based on how much bitrate that particular moment of the song needs to maintain the highest quality sound.
Just use the -alt preset standard (or extreme if you really want) keys within EAC + Lame codec