if you use dvdinfopro to find out
i) the firmware version of the drive.
ii) the media code for the datasafe 8x -R
There is at least one thread about the official 1.07 firmware, with a link to the firmware.
To install the firmware is easy. Unpack the archive, run the program and follow the prompts. There is always a small risk when updating a firmware but it is very small.
The official 1.07 may add 8x support for your discs. However, I think you are more likely to need Herrie's hacked firmware.