Why would you shout that late? You can shout 5-6 seconds pre pull and not waste the GCD as you charge. pot & ST ~2sec pre pull.
Now your opening rotation: I haven't played Arms for quite some time but why don't you MS before CS and why do you TC after BS? TC into BS should yield more DPS due to more DW ticks unless I'm completely missing something.
PS: I hope you realise that the ST debuff is mostly wasted for us anyway due to CS (0*0.8 still remains 0)