Hi and welcome to the forum, ConkersM9!
There is a later firmware version for that burner. It might give you better burning result with those discs.
http://www.firmwarehq.com/Sony/AW-G170A/files.html
You also selected 16x write speed (MAX) but the speed was not great.
Might wanna check if DMA is enabled.
http://forum.imgburn.com/index.php?s=&...dpost&p=967