Before we jump to any conclusion, can you try burning other media as bob11879 suggested and show us the scan? It might be your TY batch or quality variation within a batch. I had an experience with "bad" TY (bought 3-4 months ago) but not as bad as yours. Spikes around 60-120 max PIE at then end of the disk. With my new T02 (TDK made in Japan) I got from bestbuy yesterday, I got excellent result.
Burned with Plextor 712A
fuji T02, @12x old scan, only "very good" in my book, spikes PIE max 66.
tdk T02, @12x excellent scan (new batch?) clean below 20 PIE max.
Burned with BenQ 1620A
fuji T02, @16x old scan, again only "good", PIE max above 100.
fuji T02, @12x old scan, excellent, PIE max below 10.
tdk T02, @16x new scan, excellent, PIE max below 10.