download an evalutation of aa1.5 if you haven't already got it and try the centre channel extractor's "6db vocal boost" preset - you can do things with that tool that you wouldn't believe. I've just been using it on an orchestral recording with oboe soloist, recorded with a single stereo pair - the oboe was a bit distant (the mic was on a very high stand), but that "cce" effect allowed me to put an imaginary spot mic on the oboe and that's made it just right. I believe no other program can do this.