Better late than never.
The Write Strategies part in CD-DVD Speed is wrong. It only reports 4x for any and all discs that I’ve used, and does the same for everyone else. Ignore it. Usually, when a drive offers a speed, it has a write strategy for that speed. [Some exceptions apply, such as having to enabled OverSpeed to get speeds higher than 8x for 8x media, unknown media, etc.]
You can always load your firmware into MCSE to see what strategies are available for what discs…