Most Singapore-made SL Verbatim's were low-speed media, if my memory serves me right, these "holy grail" burns were only possible on CMC PAPA MCC 00x and early production TYG02. I have seen < 5-10 of 0 PIF results so this was a very rare thing to accomplish, however there were batches of PAPA that produced typical PIF results of 10-50 total.
And you make good with what you got. There is no other way, and staying within the constant mindset of "grass is greener on the other side" is a miserable way to live life. The current media is within the realm of acceptability and we ought not to worry too much about the scans, there is only so much in our control, if you know what I mean.
In my experience when scanned on desktop DVD writers (post-2005) the jitter tends not to affect PIF as much as it does PIE and even then only when it is excessively high (12% etc) that you get the tsunami effects. PIF can deteriorate but more often I've seen it stay the same as the jitter increased (between different burns, on the same burn it's usually visible if there is variation, hence my emphasis on the stability of the jitter).
There is no direct correlation however and you should be scanning with jitter enabled as it's supported on your BenQ and most Lite-On's as well. Old Lite-On drives required 4X scans in CDspeed, and newer ones need a patched version but with it the jitter scan works perfect even on my iHAS B rev. drive (my newest Lite-On), not sure if it's possible on rev F.
And if you have time then you could also analyze pit formation in much higher detail with TA Jitter scans.