Disc quality is more a matter of media used and recording speed.
Additionally, the score shown by CD/DVD speed is not a good indicator for the quality of a given disc. Additionally, the scanning results often vary heavily with the read speed chosen. For older NEC drives, 5x read speed was a common recommendation, but this must not be necessarily valid for the newer generation drives.
And since you are asking for firmware updates (any drive is flashable btw.), you want to check Optiarc website if there are official firmware updates available. If the drive came with a brand name computer (Dell, HP, etc.) then their support website is the place you want to go.