AAA (Dance Machines) Arcade Songs

I can NEVER seem get AAA on any song when playing on Dance Machine arcades ??

I mostly play on :

Dancing Stage Fusion with (2x & Solo)

and all I can with the score when clearing the song is :

AA* (*)star

and when I use to play on Dancing Stage Euromix 2 with (2x & Solo) all I could get was :

AA

I have tryed everything and can not seem to get AAA on a song and become a "Dancing Master"

any help/tips would be great :-(

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