So this is your log
https://www.warcraftlogs.com/reports...done&source=15
You're not pressing your buttons enough, it's a 1 second gcd class and it's pretty much gcd locked:
-Assuming with your haste your keg smash cd is above 7 seconds, if you press it every 8 seconds you should get 56 when you get 39, that's a huge amount of brews you're just not getting, it's the same for blackout strike you don't get close to what you could, that's a lot of non dodged hits, missing a few breath of fire resulting in only 58% uptime on the debuff, again a lot of passive mitigation down the drain
-You're equiping 2 on use trinkets and not using them at all, you'd actually get a lot of selfhealing from it and stabilise way easier, you could also just swap to a passive trinket like the darkmoon card that you can't forget to use but is also just better
-You're going for a lot of mastery, this is not efficient especially because of the poor rotation, almost all your secondaries are sinked into mastery yet you dodge only 52% of the hits, that's not efficient, versatility is a better stat
-Your poor rotation is creating a poor brew gen and you're barely purifying at all and worse, dropping ironskin brew which makes you a tanking windwalker
So yeah the core issue isn't stats or strat it's basic gameplay, this boss isn't really threatening for monks assuming your healers are positionned to heal you at all time