Regarding critical damage with the revamp

30% on mastery skill has a 423-939 range, 423/939 = 45%
20% on mastery skill has a 329-939 range, 329/939 = 35%
0% on mastery skill has a 141-939 range, 141/939 = 15%

And I'm assuming 370-569 (370/569 = 65%) is with maxed mastery, which gives 50% bonus mastery.

Yeah, 370~569 is with max Mastery. Is it possible that different classes get a different base mastery?
I'm seeing ~15% with my Ranged characters (Slinger and Wild Hunter), ~20% with Melee (Brawler), and ~25% with my Mages (Battle Mage and Magician)

 Level 30 Brawler, 0 Mastery, 51~254

 Level 30 Brawler, 1 Mastery, 81~254

 Level 11 Wild Hunter, 0 Mastery,13~86

 Level 48 Battle Mage, 0 Mastery, 158~633

 Level 23 Magician, 0 Mastery, 66~262