The slowest speed your burner can do is usualy controlled by the burners firmware or chipset. So Nero and your burner should *not* be the problem. The 'blank' media you use will NOT cause a video/audio sync prob.
I would guess your source is out of sync. Have you tried mounting the 'originals' on a virtual player? I bet they are still out of sync. This would eliminate your burning habits as the cause of your problem.
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