I have found that this simple shot priority works very well for maximizing single target DPS....

Misery's End (Below 20%)
Raging Strikes
Hawk's Eye
Internal Release
Barrage
Bloodletter (Use on CD/Weave In between GCDs of CDs on Opener)
Venomous Bite (Keep up at ALL TIMES)
Windbite
Flaming Arrow (AE that is off the GCD, lasts 30 Secs... really no reason not to use it.)
Straight Shot (Only use to maintain the 10% CHR/To Consume Procs of Heavy Shot's Additional Effect)
Heavy Shot (This is your bread and butter/filler)