Your gear and spec looks pretty good. You might be able to tweak it some for a minor performance increase.
I get the feeling you posted more because you were middle of the pack on that fight and want to do more. I feel the same way most of the time.
The boomkin who barely beat you on that fight got DI and you didn't. I would try to make a case to your raid leader that it would be better served on you. You will definitely gain more DPS from DI than the Boomer. However the Lock might be doing more putting DI on the Boomkin. As the Lock was significantly behind you I would say that is irrelevant. Raid First. If you can't get it on every fight, see if a rotation can be set up so you at least get it some of the time.
You had three mages, they probably rotated Focus Magic, so you are probably out of luck there.
Speaking of Mages, Fire Mages are doing really well on Ultraxion. Add to that both of the Mages at the top of the meter have the Legendary. Basically they were the only two casters who really beat you on the meter, the rest were melee and hunters.
Looking at the log your dot and buff uptimes were good. You cast MB every 9.2 sec, pretty good. A hefty boost to our DPS when the boss is sub 25% is SWD. You didn't cast any... I don't either. Its too dangerous, so there is some additional damage Blizz has taken away from us, just like they did on Baleroc, the last tiers DPS measuring stick. There is also no movement on this fight so Apparitions are limited. Looking at your trinkets, you actually clicked on your "On Use" one each time it was up, good.
Overall I think you look good and performed well.
If you are looking for things you can fix though here is a short list.
Drop mining for Blacksmithing or Tailoring. You will get a definite DPS upgrade from that.
You could drop the Purified in your helm and replace with a Brilliant. It would drop you to 1727 Hit rating, but that is OK.
You could race change to Troll or Goblin. The racials are much better than Forsaken. I know it costs money, it is silly to do just for a slight bump but it is an option.
Focus on tightening up your dot refreshes. Its not as terrible as it used to be refreshing early, but you can squeeze out some extra dps with a few more globals freed up.