Someone said i could empty the cache of my 360, which would allow me to re-expose the XP that was currently cut-back by Rockstar.

It is great being able to do this once more, but playing in a world all alone isn't much fun. You can't go online, which is the potential awesomeness of this game after single-player. Why play multi-player alone, it isn't good and you cannot get better (except with gang hideouts).

Recommend no-one do this, unless you are sad and have no friends and are too scared to play online against the world. I know this game has spawn-killers, i've experienced them myself. Best way around this is to form a posse, as members will come to your aid if you are in trouble.