PSU imPerfect Bible lists some percents for C and B grade grinders. I think they're the odds of a particular grinder's success when grinding from +9 to +10...buuuut I could be wrong so here's the Japanese (can't seem to post the kanji so romaji will have to do. Apologies).
Sono grinder de kyoukasurusai no, juukaime no seikou ritsu. Jissai ni wa kyoukakaikazu ya seireiun nado no hosei ga kuwawari, seikouritsu wa kore yori mo joushousuru.
C+1 = 5%
C+2 = 15%
C+3 = 20%
C+4 = 25%
C+5 = 30%
C+6 = 35%
C+7 = 40%
C+8 = 45%
C+9 = 50%
C+10 = 65%
B+1 = 0%
B+2 = 10%
B+3 = 16%
B+4 = 21%
B+5 = 26%
B+6 = 31%
B+7 = 37%
B+8 = 42%
B+9 = 52%
B+10 = 63%
Oh and these %s are for 0 luck apparently.
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