DVD burn doesn't offer correct speed

I have an iMac iSight (PowerMac12,1 PowerPC G5) with Matshita DVD-R UJ-846 SuperDrive. Mac OS X 10.4.8. According to the Tech Spec this iMac writes DVD-R and DVD+R discs at up to 8x speed.
If I use DVD-R media, and try to write using a burn folder, Finder says the maximum speed is 2x. Toast Titanium 5.2.3 also says the maximum burn speed is 2x, it correctly reports the disk size as 4.something GB, and offers Simulation mode burn.
If I use DVD+R media, and try to write using a burn folder, Finder says the maximum speed is 8x. Toast Titanium 5.2.3 also says the maximum burn speed is 8x, it incorrectly reports the disk size as 8 GB, and does not offers Simulation mode burn.
What on earth is going on?
I appreciate that Toast is not an Apple product, but I expect Toast is only reporting what Apple tells it, and similar faults appear in the Finder response.
Does burning from Finder verify the disk, because at the end of the process, there in no window visible saying that verification was successful?
(Note this does not seem to be related to the fault on SuperDrives relating to High-Speed media (Apple article 86130), because my drive is not a Pioneer drive).
iMac iSight G5 Mac OS X (10.4.8)

Note the phrase "up to". The maximum burning speed may be less than that specified on the disk blank, especially if the discs are faster than those available when the drive was manufactured. The drive make, model, and firmware version of the drive, and the brand of disc, may limit the speed to a lower value than that specified for the drive or the disc. For example, the first Quicksilver superdrive would burn 2X DVDs at 2X, but would only burn 4X DVDs (which didn't exist when the drive was made) at 1X. Try different brands of discs. I have good luck with Verbatim DVD-R. The newer Pioneer drives seem to be able to burn discs at their rated speed.
I don't know why Toast would report the wrong disc size. When using Finder's burn folders, you can click the small round button at the lower-right to see the disc size and space used. Does it show the correct size for the DVD+R discs? Are you sure they are not DVD+R DL discs, which are larger?
The Finder does verify discs it burns. If you look at the progress bar, you will see it change from "Writing" to "Verifying". If there is a verify error, it will eject the disc, rather than mount it, when finished. It will also display an error window. If the verify is successful, it will mount the disc, but not display a window. Disk Utility gives you a choice of what to do when the burn is complete, and always displays a window indicating success or failure.

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