I have read that massive spikes can often be ignored but the following scan made me wonder - does the fact that the spike is at the "beginning" also mean that it is at the beginning of the movie that I backed up ? it seems that most problems occur as the disk speeds up towards the outside of a disk and towards the end of a movie
Apart from the one off 656 and 19 the burn looks good. It plays ok.
A 12 X verbatim - unusual. I burned again at 8X and got 97%