From my experiences (of 9 days!) with TS-H552B, I would just recommend you to write another of those DVD-Rs with the BenQ - or take one you burned with it - and scan again ... and think of making copies of discs with that high POF rates with the BenQ.
I also have some DVD-R (Verbatim) I wrote with the H552B and my laptop had problems reading them - scans with the BenQ looked better than your scan, but bad anyway. I think the writing quality of those Toshiba/Samsung drives is "not really good" ... at least.
Finding out about that and making better burns in the future surely was what you bought the BenQ for?