Focus Issues

let me start off by saying I love this website and all the help people are giving each other. I am a newly 90 first time hunter and I have been using a marco I saw from the hunter forums…

/castsequence reset=target Serpent Sting,null
/castsequence reset=0.5 0,0,0,0,0,A Murder of Crows
/castsequence reset=0.5 0,0,0,0,Black Arrow
/castsequence reset=0.5 0,0,0,Kill Shot
/castsequence reset=0.5 0,0,Glaive Toss
/castsequence reset=0.5 0,Explosive Shot
/castsequence reset=5 Arcane Shot,Cobra Shot
/cast [combat] Rapid Fire
/cast [combat] Arcane Torrent
/cast [combat] A Murder of Crows

I lvl 505 Gear and I have a couple questions maybe someone can help me with. First off using this macro that was recomended from some others on here that they loved it. Im im getting focus starved for like 5-10 seconds at a time when I spam this macro. I have reforged to optimal settings using Ask Mr Robot for what stats i have. I dont know what im suppose to be doing in DPS at lvl 505 but im only doing 60k-70k on LFR Bosses. I dont know what im doing wrong.

  1. is it bceause Im not high enough item lvl that I am focus staved?
  2. I seem to have some issues with “/castsequence reset=5 Arcane Shot,Cobra Shot” it doesnt seem like it fires off all the time.
  3. if I try add Cobra Shot on another button and then mix it in I lose a lot of DPS from the amount Im already doing.

any help would be awesome.