My burner hasn't ever failed in this kind of burnings.
Of course, I burn at 4x or 8x (max speed), then I burst with the burner to see if CRCs match. As burst is not always reliable on some drives (like with my DVD, it sometimes goes too fast) , then you can use secure mode to do this. With the burner BURSTing a freshly burnt disc is reliable, at least what I have tested until now .

I reread the copy to make sure it is not a read error.

I also do that; per example my DVD drive sometimes displays a non-matching CRC on some track when BURSTing and it has nothing to do with the disc, as re-reading displays CRC correctly, just it went too fast the first time .