My Experience with Verbatim 8x 50x cakebox:
The media is very inconsistent in quality.
Even within the spindle, one is great quality (excellent score, 99%) when written at 12x. The next one is nearly a coaster at 12x but they can be written good at 4x (U can check it before with QScan).
Verbatim MCC004 are far more consistent, all of them had good quality at 16x.
I would throw this disc away and burn again.