Concerning mp3gain and Replay Gain in general: You might want to start using a tool which implements gain scanning based on "EBU R 128" (google it). E.g. foobar2000 changed it's scanning code to libebur128 in version 1.1.7.
Also I don't recommend anything that changes the audio data directy. So this includes wavegain as well. Just encode it to flac and apply gain correction via metadata.
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