Well, I think burning at 2X (instead of 4x) may have made a H U G E difference, far more than the type of media used or even than the model of burner used perhaps...
I just burned an UHD 50GB BD-R DL
(Verbatim 'Hard Coat') at 2X speed and the quality scan numbers so far (to the same specific point in the disc) are MUCH MUCH MUCH lower so far than the discs * burned at 4X (albeit early in the quality scan process, so let's see if that holds true, but to this point it is already much lower than the other discs were at the SAME point in the scan)!!!
Either that, or ODC 1.8 and my Lite-On drive are finally scanning properly!!!
* I just need to scan a 4X-burned Hard Coat again to be sure though. I have the LiteOn plugged directly into the laptop, but thought I did that yesterday too with my last scan and the numbers YESTERDAY were still bad.
Anyway, WOW. If this scan ends up as good as I think it will,
I may burn everything at 2X, IF that could help with BD-R DL longevity.
My Philips and Verbatim discs (two types of Verbatim) burned at 6X and 4X all played fine in my home BD player (not including the HP batch); otherwise i would have considered the much slower 2X speed much earlier.
I was shocked yesterday how high my LDC and BIS numbers were (in a bad way);today's scan of the 2X burned discs are the exact opposite!!! Unbelievable turnaround...
Will wait for the entire scan to finish and share the results here (screenshots).
VERY HAPPY!
Can't wait to try the 4X Hard Coat to confirm the 2X speed made the HUGE difference.
Then I will burn some Verbatim JP and Philips discs at 2X as well and run the quality scans.