MBI Verbs are not crappy, they are different. This is a confusing and very annoying topic.
Firmware strategies are not always adapted, and depending on the drives you can get excellent or so-so burns.
As you have a SB capable drive, try to enable SB for known media with these, you should experience an improvement. If you don't, then it's a so-so batch (though the 12X burn is good, just not what one expects from MCC004, I agree - I wonder where these POFs come from BTW - looks like a glitch to me ).
BTW, in case you're not aware of this, all Benq 1640 16X +R burns will show this "toothbrush-shaped" PIF figure, with high PIF peaks after 3GB. This has nothing to do with the the media quality, it's the drive. Just burn 16X +R media @12X if these peaks bother you.