Reject significant deviants. How many different kinds of the same song can there be if they're the legal kind?
Your biggest problem is that you don't want to play other characters. Mono usually can't beat too much.And don't say that I'm just saying this because I'm an awesome pointman or something, I also only play mono. I just don't care if I can't get a highscore.
If you're that fussed, delete your ash and re-analyse the track, or re-rip the track to a different format and re-analyse the track, see if you get a better track to play on.