CSG is getting punished on blowout for their harsh grading. I have two cards where I believe their math is off when it comes to centering.
The worst was a George Brett cert 1013074003, where the centering seems like a 6, not 4.5, judging by counting the pixels. It certainly is off center, but using one of the centering tools, or counting pixels, it seems like a miss. Judge for yourself.
Being a tough grader is one thing (which is good), but being overly punitive is not going to help CSG long term.