bad song to pick
You have great mixing skills. This is very good, but; however, hard to sing along or even bob your head to. I think that this song marrs your potential, because this song is not meant to be made into this type of song.
In the future, I think that you should use the same key as the song, and if not, then at least the same type of key (major, minor, etc.) [this song's key is F minor]
Also, in dubsteps, I RECCOMEND using your bass to a lower octave than you had it for part of the song.