You are not wrong, the TY 's are only the 4x variety in both + and -.
I should have done my homework before purchase, but under the circumstances it was the only Made In Japan there so I grabbed it.
I'm confident they will burn well from what I've read, however, I had huge success with the Ty media, when something works stick with it.
Here are some of the codes:
Maxell DVD+R 4x (RICOHJPNR01)
Maxell DVD+R 4x (YUDEN000T01)
Maxell DVD+R 8x High Grade Video (MAXELL002)
Maxell DVD-R 1x (RITEKG03....)
Maxell DVD-R 2x (MXL RG01....)
Maxell DVD-R 4x (MXL RG02....)
Maxell DVD-R 4x (TYG01.......)
Maxell DVD-RAM 3x (MXL8)
Maxell DVD-RW 2x (MCC 01RW11n9)
Maxell DVD-RW 2x (TDK502sakuM3)