I have done some testing with the new Dreadguard proc relic, and the number doesn't seem to add up on the operation dummy. My spec is 13/0/28, with 28 in the rage tree, including Shii-Choo mastery.

The proc relic does 288 kinetic damage, The training dummy has an armor rating of 35%. With no armor penetration, I should get..

( 1 - 0.35) * 288 = 187.2 (roughly)

With 30% armor penetration from Shii-choo form and Shii-choo mastery, I should get

(1 = 0.35 * (1 - 0.3)) * 288 = 217.4

Instead, what I get is 209 damage constantly.

I just can't figure out how I got to 209. The closest I can come up with is that Shii-choo mastery is still 20%, not 30%. Then it's 207.36

Am I missing something?