Well I hear rap - snap- clap (sounds like a new cereal) keep the rap, eliminate the snaps, lower the claps and fire the mixer, and give the singer a raise.
On a serious note, mixing has been my biggest challenge and still is so instead of giving advice I would definitely consider the advice you get from this forum. I can't say enough for these guys and help I've received. If this is a mix of numerous tracks, try playing the percussion track only, then one at a time add another track adjusting for its vol, timing, etc and how it brings out your style. If not so much, tone it down or eliminate, and lay it on when it sounds and feels right. If you hit a flat spot on the voice, delete that spot and dub in on a separate track, that's my guitar trick. Now, remember this is coming from a bone head amateur who can't rap or sing. SO you can listen to one of my tunes and get me back.