These discs all show VERY high jitter (which is likely the primary reason for the grossly high reported errors), which raises some questions. The drive may be doing a poor job of reading the discs, the jitter levels may be valid, I don't know. None of these discs are so bad that really awful results are to be expected, even Ritek R03 is decent and Optodisc OR8 is usually quite good.
Turning WOPC off is unlikely to solve anything, leaving it on is the default setting and is usually the most appropriate setting. Burning 8x and 16x media at 4x, on the other hand, can sometimes yield poor results so I'd generally suggest 8x for 8x media, 8x or 12x for 16x media.
I suggest you try these discs on anther drive, see how a TRT (transfer rate test) performs. If the test completes without significant slowdowns, then there's probably something wrong with your Benq's reading capabilities at this point.