Not sure what thread you are referring to, but if you have created the ISO using DVDD then you should be fine to burn it straight back using the MDS file as it will contain all the info about layer break etc that you need. The problems you are having are certainly due to the piss poor media you are using and you could use a gallon of petrol and a big box of matches and still not get a decent burn. As the others have said, Verbs are the way to go on dual layer. I know it's a real pisser when you have a stack of crap dual layers that you want to use but the best thing to do if you cant exchange them is offer them to a ninja as cut price shurikens!!
"Hi Ho, Hi Ho, its off to buy verbs I go!"