sorry the link i posted for the benq QSuite was invalid, heres a new one:
http://www.benq-eu.com/support/downl...nloads&dtype=A

still my vote is for the disc. and i dont use DL disc.
http://club.cdfreaks.com/f76/mitsubi...vd-r-dl-97058/
http://club.cdfreaks.com/f76/ritek-dvd-r-dl-101326/

if you dont want to try the crossflash? what i would do is get EEPROM: (the rpc1 site seems to be down.)
http://club.cdfreaks.com/f44/eeprom-...-3-new-112103/

use this to reset learned media and reset hypertuning. then get smartburn:
http://www.liteonit.com/global/index...per&Itemid=153

and use smart burn to set hypertuning and online hypertuning. then do a few new create disc and quality scans with nero cd-speed and then turn off ht and oht. what this will do is allow your drive to Learn the media. but if your drive doesnt like the disc there is probably no hope.

if all else fails my recommendation is just to read for yourself:
http://club.cdfreaks.com/f61/
http://club.cdfreaks.com/f61/top-5-o...te-now-234126/
http://club.cdfreaks.com/f44/lite-lh...s-here-201092/
http://club.cdfreaks.com/f44/f-q-lit...2007-a-109986/
http://club.cdfreaks.com/f44/compreh...-2007-a-83441/