You're in PvP gear right now so I am unable to comment on your gearing.
Looking at the Ultraxion Kill
Your MS usage is very low. It should be your number one priority at any point outside the Execute phase, and sometimes even then. OP use is OK. Slam use is incredibly low. Compared to other abilities HS is really high. Make sure you have your priorities right, HS is less important than both MS, OP and Slam, even if you have your 2t13 bonus active.
At one point it took a fairly long amount of time for you to use CS after Sudden Death procced, another time you forgot to use it almost entirely (took over 10 seconds for you to use CS after it became available)
Your Rend actually fell off during the fight, as did your stacks of Slaughter, this should never be allowed to happen.
I'd argue that you could use Inner Rage more often, there's a large segment of the fight where it goes unused. Berserker Rage was not used at all. Not only is it 5 rage off the GCD but it also doubles the rage you get from damage taken, which can be significant on a fight with as much raid damage as Ultraxion.
Fight is 5 minutes or lower. If you know this before it starts you should save Recklessness for the Execute phase (unless you need burst at a specific point of the fight). You only used your Orc racial once, should be able to do it at the very least twice, preferably three times in a fight of this length. Deadly Calm was used twice, preferably this should be 3 times in a fight of this length.
Hopefully this helps!
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