I put together an Arms action priority list using the T15H Arms profile and swapping to a 2 OP+3 GCDs CS rotation. I also tweaked reck/BB logic. DPS went up about 3000 and comes out to about 174500. I left out impending victory, heroic throw, and storm bolt from the actions for now to keep it simple. I plan to work on it a bit more and re-include those abilities if any are worth it and then make a pass on the gear selections. I'm also seeing some other issues I can't explain though:
Dragon Roar is hitting weaker than I expect by a significant margin. Is this benefiting from all of the physical damage mods that it should? Specifically, are Enrage, Seasoned Soldier, and Skull Banner affecting it like they should?
Opportunity Strike proc rate is lower than I expect by a fair amount(about 14% lower). With 38.04% mastery and 592.5 uses of abilities that can proc it, we would expect 225.4 OS procs, and there are only 193.7. Is everything that's capable of proccing it doing so?(CS, Dragon Roar, Execute, Heroic Leap, HS, Autos, MS, OP, Slam).
I know there is also a very small ICD on the "last chance to proc" OS that prevents multiple proc chances if more than one ability lands in a small window. This can be seen by using any AoE with a lot of htis or by macroing a GCD ability with HS and hitting something. You will only ever get a single proc, and that proc rate is the same as if you only landed a single hit(demonstrating you only got 1 chance at a roll, an ICD on last chance to proc rather than the proc itself). However, in real world testing of a normal rotation, I usually see about a 90-95% rate of procs compared to the expected value, rather than 86%.
Bloodbath damage also looks lower than I expect. Is every ability that ought to contribute contributing?(CS, DR, Execute, HL, HS, MS, Opportunity Strikes, OP, Slam) It also shouldn't munch or roll any damage like old Deep Wounds did since this kind of mechanic has apparently been fixed to be more reliable this expansion, if that's what's going on.
action priority list:

actions=auto_attack
actions+=/recklessness,use_off_gcd=1,if=target.time_to_die<=18|((target.time_to_die>=186|(target.health.pct<20&(debuff.colossus_smash.remains>=5|cooldown.colossus_smash.remains<=1.5)))&(!talent.bloodbath.enabled|!cooldown.bloodbath.remains))
actions+=/mogu_power_potion,if=(target.health.pct<20&buff.recklessness.up)|target.time_to_die<=25
actions+=/bloodbath,use_off_gcd=1,if=talent.bloodbath.enabled&(target.time_to_die<=18|buff.recklessness.up|target.time_to_die>=75)
actions+=/skull_banner,use_off_gcd=1,if=buff.recklessness.up
actions+=/avatar,use_off_gcd=1,if=talent.avatar.enabled&(buff.recklessness.up|target.time_to_die<=24)
actions+=/use_item,name=gauntlets_of_the_last_mogu,use_off_gcd=1,if=talent.bloodbath.enabled&buff.bloodbath.up
actions+=/berserker_rage,use_off_gcd=1,if=buff.enrage.down
actions+=/heroic_leap,use_off_gcd=1,if=debuff.colossus_smash.up
actions+=/heroic_strike,use_off_gcd=1,if=(((debuff.colossus_smash.up&rage>=70))&target.health.pct>=20)|rage>=rage.max-10
actions+=/execute,if=target.time_to_die<1.5
actions+=/dragon_roar,if=talent.dragon_roar.enabled&talent.bloodbath.enabled&buff.bloodbath.up&buff.bloodbath.remains<1.5&target.health.pct>=20
actions+=/mortal_strike
actions+=/dragon_roar,if=talent.dragon_roar.enabled&talent.bloodbath.enabled&buff.bloodbath.up&debuff.colossus_smash.down&target.health.pct>=20
actions+=/colossus_smash,if=debuff.colossus_smash.remains<1
actions+=/execute,if=debuff.colossus_smash.up|buff.recklessness.up|rage=rage.max-25
actions+=/dragon_roar,if=talent.dragon_roar.enabled&(talent.bloodbath.enabled&buff.bloodbath.up&target.health.pct>=20)|(debuff.colossus_smash.down&target.health.pct<20)
actions+=/slam,if=debuff.colossus_smash.up&(debuff.colossus_smash.remains<1|buff.recklessness.up)&target.health.pct>=20
actions+=/overpower,if=buff.taste_for_blood.stack>=3&target.health.pct>=20
actions+=/slam,if=debuff.colossus_smash.up&debuff.colossus_smash.remains<2.5&target.health.pct>=20
actions+=/execute,if=buff.sudden_execute.down
actions+=/overpower,if=target.health.pct>=20|buff.sudden_execute.up
actions+=/slam,if=rage>=40&target.health.pct>=20
actions+=/battle_shout