Just messin' around... I'd disable the C1. Then I would cut the gain back a little on the CLA-2A to reduce the volume on the vocal - see how that sounds. Then I'd put that gain back where it was and cut the mix fader a few dBs - see how that sounds. Still the main point being to reduce the vocal's volume, not really going for much compression. Just see what these sound like.
I might even duplicate the track and do one on one track, the other on the second. Then you could flip between them on playback to get a quicker, on the fly comparison.