Waited way too long for first blood letter, should've been the first move you did after straight shot because you easily would've had another one by the time you actually used it and you delayed some of your bloodletters for less damaging/cooldown oGCD moves. You were good with your cooldowns from what I saw pairing up raging strikes/internal release and barrage/hawk eye/blood for blood. You're opener is a mess, where did you learn it from? I'd suggest using either of these two openers.
1 2 as both have been tested as reliable, the first has a good ramp up whereas the second has amazing burst, but delays your cooldowns a little be more if you use barrage on your second EA. You also should pop your flaming arrow after you pop all of your cooldowns so it gets the full benefit of the damage and crit ups.
Because it fucks with the parse on if a dummy is to get within 20% of their HP to use it before filling up again. It skews it to be unreliable because that would never happen in an actual fight.