need help with stepmania cant get AAA no matter what i score

[smerfgod]

hi all i need help just a simple answer if you have one i use stepmania and iv been playing for months now and no matter what score i get i never get a AAA i have it set on max 2 rating and marvous timing off so it plays like drr this is where it starts making me think theres somthing wrong with my game i play heaven is a place on earth original sim file its a 10 footer on chalange i got 489 perfect 1 great 0 good 0boo 0 miss 0 ok max combo 489 score 179803762 and i only got a AA that was the last straw i figured id come on some forums and get some feed back about this let me know ok thanks