I hope you don't mind if I respond in the forum, but I'm choosey about who gets my e-maill address.
If it's not the media that's messing the burning up then it might be your pc.
If the computer is under stress (i.e. loads of programs running at once) then that can make all the diffrence between a good and bad burn. Although your burner has buffer underun protection, if it happens too many times the CD/DVD can have errors (especially if the buffer runs out half way though a file).
At 2X the computer does not have to work as hard, so there are no underuns.
Defrag your hard disc and try burning just after re-booting, and see if that helps.