All burns/scans were done under minimal system load conditions using Liggy's 1-02 RPC1 firmware (apart from the first one which was done with the original NEC 1-02 firmware. I noticed that this drive suffers from the same problems as my previous one (ND-6550A), which was very high PIEs towards the middle of the burn with cheap media. Will try it with some Yudens and MCCs next.
...Just realized that I can't upload the scans. Will post them as soon as the server allows..
By the way, when burning with ImgBurn I noticed that the percentage of the drive's buffer never goes more than 96% (whereas the buffer's green bar is full). Is this normal with these burners?