Maybe TY02 from TDK are a sort of B grade???, Are those TDK TY02 also made in Japan?
Burn A TDK TY02 at 8x speed, just to see what the effect is on the burn quality.
I've had all kind of different quality issues with Ritek R03 media.
Ritek R03 > Ridata = low PIE and low PIF very good
Ritek R03 > Arita = high PIE and low PIF
Ritek R03 > Ritek A grade = low PIE high PIF
I'm glad I could buy Fujifilm TY02