I think it will burn all the way to 16x, but I normally slow it down to 2x or 4x, as I feel it is less likely to have errors. Rushing is not a concern, but quality is.
The burner is in a computer, and it is a Pioneer DVD-RW DVR-110D. I also have a TSSTcorp CD/DVDW SH-S182D in another computer, but either of these normally cause no problem at all with the same software.
Verbatim DVD-R, good quality disks, again been using a lot of them and rarely is there a problem. As previously stated, the program is Clone DVD2.
As far as bitsetting goes, my understanding is that the firmware needs upgrading to do it, but with DVD-R disks, that is unimportant. This has never been an issue before, and I have burned hundreds of disks this way, just this one time it is a problem, and I was hoping for some help, please.