Just to clear up a few questions.
TG is YUDEN000 T02. Only TYG02 discs have GG. Your hub codes are fine.
Only TY's CD media is frosted. I'm not sure about 2x TAIYOYUDEN (2x DVD-R) media by TY, which is a mystery anyway.
If you can make a photo it would be good. Or just do a quality scan to see whether TY discs have quality problems at the end.