Here's the transfer rate test results. I stopped the test early since, like you said, the speed went way down at the end.
The disc plays fine from start to finish in the same drive which burned it.
Stereodude, I saw some scans one one of your posts from your LiteOn iHBS112 drive of the same media. I believe my Asus BW-12B1ST is just a rebadged version of the same drive you have. Yet your LDC Avg was 24.62 and your BIS Avg was 0.48 for the same media code I'm using here. Even if you discount the huge values at the end of the scan, my LDC values linger clos to 1000 and my BIS values linger around 25. That seems pretty bad. I even repeated the scan with the same results.