I think its a bad idea to crush such genre, even for pop rock this limiting is too much. low end has zero punch and the mix is blurred and clipping.
Mp3 conversion also has to do with this but you should seriously use more dynamics, people might enjoy the song when first heard but they'll get bored pretty quick couse the emotion is missing.
Probably you got the vocals a bit too high but I'm not sure with current version. Anyway, good songs deserves good mastering
