Help me figure out my DPS (willing to pay for a solution resulting in figure out my dps loss)

[liverbiird 0]

now ive tried diffrent ways of doing my rotation but i still cant seem to "hold it up" i am high up at start...til like 30-60sec into the fight then i start falling behind:(

So iam willing to give out 1 token to whom ever can give me a reasonable, understandable solution that works for me
(i know i didnt optimize my trueshot, prepots etc etc) But the problem is after trueshot and my troll racial is "over" i start falling:(
this is what i wanna figure out, ive tried to do Aimed and then barrage/windburst etc but i seem to starve on focus, ive tried the 2aimed then some cd's but seems i fall behind on Aimedshot dmg then:(

https://www.warcraftlogs.com/reports/xZf9NW1KV6nyLgXQ#fight=30&type=damage-done&source=153          <----Log of the actuall kill
here i got run over, but still my numbers are abysmal  (7% pref(

here is the same rotation but a wipe  (29% pref)
https://www.warcraftlogs.com/reports/xZf9NW1KV6nyLgXQ#fight=28&type=damage-done&source=153 

 

another wipe, same rotation but only 9% pref

https://www.warcraftlogs.com/reports/xZf9NW1KV6nyLgXQ#fight=27&type=damage-done&source=153 

So even with the same rotation (atleast i think and feel like i do the same) i can go from 7% pref to 29% pref, i know alot of dmg is RNG but i cant be THAT Unlucky
id say my avg preformance is about 10% so iam not unlucky iam sucky:(
but i need to understand what i need to work on:( rotation i know...but is it as simple as to get the azortian down to the perfection?
cause ive seen other hunters do my "get as many aimedshot as possible into vuln phase" do like 98% pref...but when i do it i fall down to 9.8:)

tnx for any input and help

and ill be more then willing to hand out a token for a guide/suggestion that actually works for me

[cyanraider 0]

1. Your opening sequence should be, 

1. pop a deadly grace before the fight begins
2. cast trueshot and berserk
3. barrage
4. windburst
   and then on your normal rotation until 30%
5. pop your second deadly grace and trueshot alongside bloodlust

2. A couple of things to keep in mind

1. ALWAYS cast sidewinders if you are at 2 charges REGARDLESS whether or not  you have procced "marked targets"
2. NEVER let your focus hit 150. If you procced "lock and load" and your focus is nearing max, cast marked shot FIRST to dump some focus (even if "vulnerable" was just renewed", then proceed with aimed shots. Cast barrage or aimed shot even if "vulnerable" isnt up just to avoid hitting 150 focus. 
   On ALL OTHER occasions, ONLY cast aimed shot when vulnerable is up ( which should be up most of the time)

3. Because of the "bullseye" trait, MM hunter's DPS will go up about 10% towards the end of the fight, so if you wipe beforehand, the dps is not really accurate.