my vote is the disc are bad. you can go here and read about other members experience with different blank media.
http://club.cdfreaks.com/f33/

if you want to test these disc more? can you post a few screen shots from cd-speed? do a create disc at 2.4x, then benchmark and a quality test at 4x. ive had better luck with my 20A1P burning single layer disc using Benq DW2000 9B3E firmware. i dont buy Dual Layer disc so i dont know how they burn.
http://club.cdfreaks.com/1973441-post98.html

to perform the cross flash you will need flash utility:
http://club.cdfreaks.com/1523108-post1.html

also benq has a nice tool called QSuite:
http://club.cdfreaks.com/1161952-post4.html