Stalker vs AA Tier 5's

[Grailhawk]

AA Tier 5's

• Moonbow: This is SP free slayer arrows, and +3.15 elemental damage per hit.
• Arrow of Slaying: +250 base damage every 20 seconds, which is an average of +10 damage assuming a 1.25 rate of fire and reduced to an average of +6.49 damage per hit assuming 54% doubleshot
• Improved Elemental Arrows: +11 elemental damage per crit, which is assuming a 15% crit chance 1.65 damage per hit. And some nice effects
• Runebow: +2 Damage per hit

Damage per hit increase = 13.29
with a big burst and some nice effects form the elemental imbues.

Stalker Tier 5's

• Extra Favored Enemy: +2 damage per hit vs favored enemies.
• Heavy Draw: +5 damage per hit
• Strikes Like Lightning: +20% doubleshot
• Head Shot: 5[w] auto crit every 12 seconds, assuming 1d8 weapon and x4 crit multiplier that is +6 damage per hit assuming a 1.25 rate of fire and reduced to an average of +3.44 damage per hit assuming 74% doubleshot.
• Improved Archer's Focus: +5 Ranged Power

Damage per hit increase = 10.44
with a small burst, 5 Ranged Power and 20% doublestrike

IMO Stalker Tier 5 is better then AA for any one with at least 5 levels of ranger.

Math on Arrow of Slaying and Head Shot

lets assume an averge rate of fire of 1.25 (this is close to accurate for a bow) 

Doubeshot:
20% AA Capstone 
05% Shadow Arrows 
10% ED Feat 
09% ED PL 
08% Gear 
02% Ship Buff 
54% Total Constant 

1.25 * 1.54 = 1.925 Rate of fire base 
1.25 * 1.74 = 2.175 Rate of fire base with 74% doubleshot 

Arrow of Slaying: are +250 base damage every 20 seconds in 20 seconds you will fire 20*1.925 = 38.5 arrows. 
This means Slayer Arrows are an average of (250/38.5) +6.49 base damage.

Head Shot: 5[1d8] = 22.5; 22.5*4 = 90 every 12 seconds. In 12 seconds you will fire 12*2.175 = 26.1 arrows. 
This means Head Shot are an average of (90/26.1) +3.44 base damage

Any one else have a though on this.