I'm at 570ish before food on sch and 601 after using grilled sweetfish. With relic weapon I'm at 1022 crit (before food) but with sephy Sep 975 crit. I only put an ACC V in my 220 green top. Only tier 4 accuracy for everything else. My accuracy in sephy is 99.75~100%.

With all these gear set options you can pick the sets with the stats you want and focus on acc for materia.