105 at 2x

anyone else having problems writing at 2x with the a05,ive tried various types of 2x media but none will write at 2x,the latest media i bought are the datasafe 2x,only to be writen at 1x.
ive updated to the latest firmware,no change.
anyone out there got any ideas where i should go from here?
 
Datawrite Classic 2x
Bulk Paq Green Tops Generation 4 2x
Superior dvd 2X

All burn at 2x with ao5/105 and firmware 1.21
 
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