As some people already have posted, they have ALMOST NOTHING different to other Made in Taiwan TDK discs! They are made at the same CMC Magnetics plant and show almost EQUAL quality, stability, longevity etc.
As for me, Made in Taiwan TTH02 discs are usually fine, at least I don't see degradation after 6-12 months, but on the other hand, that's not a long period. Only time will tell.
Another moment is your burner. I'm using Pioneers DVR-111L and DVR-110, but yours is DVR-107D.
Maybe you should try and find some 8x media, e.g. TYG02 or YUDEN T02, maybe CMC MAG AE1, RICOHJPN R02 or MBIPG101 R04 also would be fine.
I personally have no practice on making PS2 backups and TV-records on DVDs, so I can't comment on these subjects.
IMHO, the only thing you shouldn't do is to replace these TDK 16x DVD-R with the TDK 16x DVD+R discs, because those may degrade REALLY quickly!