Gearwise, you are losing a ton of str due to dualspec tank (JC gems, gloves and bracer enchant etc) so there's that. So I know you asked to overlook it, but still, you can be self-indulgent due to this first part.
Then, you have a 530 weap, which is not bad, but with the 15% buff to SoL, when you'll get that 543-549, the bump will be so huge you'll make your first spec guildies cry.
Try to time your Execution Sentence better with those last ticks of feather. For instance first was suboptimal, and second could have been timed with both 10/10 feather and zandalari proc, which is a huge boost.
As for the SW rotation : use CS>Exo, because with your weapon, I watched your pull, and after trinkets faded you hit the boss for 75k+ with CS+HoL, against 60k+ with Exo, non crit both.
This means, you should fish for holytv proc imo, and I personally use the following rotation during SW :
HoW>CS>HoW>Exo if holyTVproc/CS if no proc>HoW>TV
rinse and repeat
other than that, on tortos : cleave those turtles (bats? kited ? killed too far from melees ?) with DS/glyphed exo! be sure to target the turtle for your Exos/HotR because of the huge hitbox of the boss. Targeting tortos trying to cleave won't work otherwise. (You can even judge turtles as they pass behind your back with mouseover macros if you really want to min/max dps gain).
Meagaera is just one shitty rng fight, so cross fingers and save your CDs for every NEW head, otherwise you'll watch yourself losing 10-15sec on SW effective uptime. Cleave those adds with DS/glyphed exo if you can. You died mid-fight, so don't draw any conclusion on this number
Durumu tries : cleave walls a bit IF NEEDED (like : your AOE pros are dead and no RB for them), but I'd rather stick with fully single target boss and somewhat clleave red adds with DS if positionning allows it (boss hitbox is enormous) and if no holytv procced.
Your in uptime is good, but be sure to always prioritize CS>J, since I can see 69HP from CS/HotR against 66 from J on tortos. This gap seems too close. Maybe because you hit J when CS and J cooldowns clashes and they will be up at the same time. Be sure to rather hit CS.
Well, if there is anything that's not clear, feel free to ask