[QUOTE=geno888;2591510]To exclude media as cause (a bad batch maybe?), did you try to burn these discs with a different drive? If with a NEC (for example) you get the same PIF spikes in the same region, then the disc is culprit.
If you don’t have other drives available, ask a friend to do a couple of burning tests :)[/QUOTE]
I did tried burning these discs with a different writer and the results were much better. And having reproduced the same behaviour on two different writers made by LiteOn, I am assuming that this is not a problem with a specific model.