Theres a few things i notice from a cursory glance. First of all make sure your KC on CD. Frequently through that you delayed it and a 1-2 sec delay on each kill command is a significant loss in BW uptime. You also seemed to be heavily focused on the adds, in my experience the adds will die, theres no question of that so maximizing single target dps on boss is your priority. I tend to focus on doing as much single target while holding Barrage if its call of the pack has <10 seconds on cd and when pack beasts come out simply md Barrage, and if I have the focus throw a few multis to get a couple ticks of Beast Cleave. Also try to be more active with BW usage, when I get 4 piece procs I immediately steady 2ce and pop BW this makes sure you do not waste potential BW resets. Also I couldn't see where your MD button is but MD is a godsend on that fight, in my guild the hunters are the most crucial part of getting kills because as tanks enter faultline they will no longer be able to pick up adds so 2 hunters md to tanks. Im really jealous of your lock only doing 50k on that fight, so much more padding to be had