I didn't find that media very good quality wise either - looking at the disc test forum for those:
http://forum.imgburn.com/index.php?showtopic=580
There appears to be a couple of low 90% burns and a lot of much lower quality ones. My preferred media of choice is Taiyo Yuden [TYG02], tests here:
http://forum.imgburn.com/index.php?showtopic=869
Quality scores here average 96-97% and there are even a couple of 99% quality burns !!
I know which one I would choose.... I have never had that error before with TY discs....