To cap accuracy on birds you're going to need a total accuracy of about 407.
Warrior polearm skill is 240, +6 merits puts it at 252. That's 246.8 accuracy.
We'll be generous and say you have 120 Dex, so that gives you another 90 accuracy.
Assuming /sam and full time hasso, that gives you another 10 accuracy.
So to cap accuracy "without aggressor" you need to be wearing +60 accuracy in gear.
How much haste gear are you giving up?
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