Armor Class and Raid Tanking

[Stonewallx39]

I have a level 60 warrior with 6350 hp and ~1275ac (depending on buffs) wearing aggro weapons and fully raid buffed

I’m looking at future upgrades and trying to decide on priorities. I wanted to see if anyone could share testing that shows the impact of additional armor class on the damage dealt by raid targets (in particular NTOV dragons, AOW, Tuna).

I had heard previously that HP was king and raid targets had such high attack additional AC was mostly trivial. However I’ve been hearing more and more conversations on the effect of AC and it seems to be a significant consideration.