I was told if the card is an 8oc, for example, and has the centering for a grade lower they will give it the lower straight grade, but if the centering is at the standards of 2 grades or lower they will give it the higher grade with a qualifier.
The 2 grade drop is only for registry purposes, as Peter said removing the qualifier will result in the grade based on the centering, which could be more than 2 grades.
The only time I"ve seen the grade not being equal to the centering on an unqualified card is if there is a tilt- then they seem to decide if the eye appeal is worthy of a higher grade or a lower one, given the centering point.
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