As the others have said, if it is as sharp as you say it would be worth while sending.
SGC does not have an o/c qualifier, although they do have minimum requirements listed for centering in their grading scale. It seems to me they can pretty leniant on occassion.
A key card like the Ryan would likely draw a closer eye, but ya just never know what different graders at these companies can sometimes see or not.
Look at the horrible centering on these cards.