I have a ACARD Dupe it burns these perfectly, visit the duplicator manufacturers web site and download the latest firmware for your controller then make sure your drives have the latest too.
Without the latest f/w it wont use the proper layer break as Witchy2k1 said.
i have a 1 to 1 and a 1 to 3, both burn 360's very well, and have correct layer break settings.
well my 1 to 1 i had to tell the manufacturer (edgedupe or edge 10) that i was getting failed burns and i presumed it was on layer break, they asked what i was backing up *coughed loudly* and when i told him that the layer break on pc was 1913760 he was like ahhh, leave it with me, phoned me an hour later and told me to check my email, and presto, new firmware to flash to my controller, and worked ever since. so the controller uses the same break as the master now.
make sure your writers have latest firmwares too, and if they are pioneers they must be above 108's.
i have asus readers in mine, and pioneers 115's as writers
i wouldnt mind knowing either if you dont mind mate how much are you talking for a dupe, never thought of one before but whilst i was reading this i just run into a prob and i could of done with one lol typical.