Originally Posted by
Hinalover
There was a bug that was causing SimC to not calculate Tigereye brew stacks correctly. This was fixed, but at the same time started showing crit as being better in lower gear. I suspect once people start getting more Tier 15; with it's higher amounts of Agi (which converts to crit); and especially the Rune, that it will start saying to stack more mastery.
For me personally, I have noticed a higher dps by going a more crit heavy build over a mastery heavy build (all while aiming for ~6776 haste rating (13.33 Energy Regen with Ascension)).