Why am I not seeing more shirk?

[Kinkoz]

It's some alright mitigation against trash mobs, and I use it in susano ex when I'm tanking him before the third buster in dps stance.

Only if the mobs are attacking you from the front, which has always been the case. The thing that made Raw + Awareness useful in dungeon content beforehand was the fact that it provided stacks. I know I made liberal use of it for faster Storm Cyclones and Decimates, which helped with AoE damage on mobs.

Like I said, it doesn't seem to have much of a use anymore outside of mitigating tank busters.