Yeah, I know. The Sound Check option doesn't seem to make that great of a difference, huh?
Well, if it really is that bad, then maybe you should get some kind of audio processing audio and adjust the overall volumes of each individual .mp3 before burning them using your usual CD burning software.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-