I've got an Excel of 2100+ shreds and mangles from our WWS reports. I'm somewhat safe bet as a test subject as I'm not benefitting from agility totems at any point on our raids, I'm mostly in MT group and was using the mark flasks on raids.
I got a gear upgrade and at the same time bought a good stack of agi pots, with the good intention of using those to test how a notable, 5% increase affects the results.
My crit rate at 41,2% yielded an actual crit rate of 35,9% (delta 5,3%) with a sample size of 1715 mangles and shreds.
My crit rate at 46,5% yielded an actual crit rate of 41,9% (delta 4,6%) with a sample size of 420 mangles and shreds (one week, I'll continue tracking this in raids to come).
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