I've decided that the nicks I found on some of my Blu Ray Discs will never lead to rot.
BRDs and DVDs are very different in composition. BRDs are two super thin alloy discs stuck on a plastic disc.
They aren't alloy sandwiched between two plastic discs like DVDs are.
So, a nick on the side of the discs rim will never lead to anything.
The proper setting for sharpness is always0. Also my Oppo BDP-103D is region free. That makes me awesome.