You're wrong there. I had already updated my firmware to latest firmware and I know what speeds my drive supports.
As the latest firmware update was released around 2.5 years ago and the log you posted a day ago shows that it wasn't updated, I'm more than certain that you don't know what you are talking about.
A burner can support 24x speeds, but the limitation in the firmware + media code still sets the rules for the available speeds. You could try to get any faster speed than 2.4x with that burner in any other program.
The major issue with the firmware for that burner is that the media code (discs) that you are using, is not even supported in the firmware. Instead it's probably using a generic write approach.