Welcome to BenQ camp... (remember you from Lite-On forum )
Your B7S9 firmware is good when using low quality media. But to get the best out of your new drive, upgrade is recommended to B7T9 or B7U9.
B7U9 will handle -R media quite good, but to be safe go for quality +R media.
BenQ firmware and utilities download (Europe)
Enjoy your new beauty.