I think its very hard to make a specific rule for qualifiers because of the variance in severity of the qualifiers and the starting point of the grade (a qualified 5 might not have the same impact as a qualified 8).
But the rule of thumb Ive often heard is "two grades lower" for value equivalent. But thats a really broad rule.
And my overall opinion on qualifiers- I hate them. Qualifiers tell me what a card "would have graded" and never get around to telling me what a card "is actually graded". But thats just me.
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