You can read about the scanning results here. If it’s too detailed, the simple rule-of-thumb is: the lower the better. But don’t let the scans make your decision, as long as the discs can be played back, then the burn results are fine.
You cannot crossflash between different chipsets unless you really want to kill the drive. You can crossflash between clones, but not chipsets. The FU is made for A- and B-series drives. But since C0deKing has retired, no more development is done to “easily” use on C- and D-series.
You may want to look into an Optiarc AD-7280S drive if/while they’re still available.