From your Signature line it seems that you are an expert in BenQ's.
I have a BenQ DW1640 with BSOB ... I burn Taiyo Yuden DVD-Rs either TYG02 or TYG03's.
Question: It seems I can only get a dependable lowest PO errors when I burn at 4X? What good is it if I have a TYG03 rated at 16X and when I burn it at 8X ... I still have PO errors ... even thought the darn final burn rates at 98% or 99%?
Any input would help. By the wya, I use QSuite 2.1 version ... I leave all my setting on Default ... expect last few discs I tried to put Solid Burn on Learned Media also.