Verbatim has recently started to outsource to TY for 8X -R medias as they are switching their MCC production to 16X media.
I confirm that here in Europe there are already many Verbatims -R 8X that are TYG02, I just ordered some from digitalpromo.co.uk (sadly, SVP doesn't deliver to Belgium anymore..), I'll keep you informed on how hey behave in my drives .
@Yoda: first do you burn 8X medias on a regular basis with your drive? I'm asking because these G04 that work well are 4X medias, and maybe (maybe) your issue could be drive-related, no media-related..? Of course, even with Verbatim and TY, you may always run into a bad batch, but this is surprising. What is your drive exactly? And firmware?
Secondly, if you're not used to buy from SVP (blankdiscshop), I can tell you their customer service is outstanding, and you can ask them to exchange your discs. I've been a customer there and never encoutered in my life such a friendly staff.