One important thing to keep in mind is that mobs have a 1-20 interval they can hit on + their damage bonus. If you have a mob that has a min hit of 201 and a max hit of 220 (200 damage bonus), it's not going to seem like ac is doing as much.
To really calculate the effects of AC we need to determine how it changes the average interval hit. Maybe going from 600 ac to 1100 ac changes the average hit on a mobs interval from 17 to 6. This can be big, especially for mobs with low damage bonuses and high DIs.
Correct method to parse AC:
Determine mobs minimum hit and damage interval. Subtract damage interval from min hit to determine damage bonus. Now, figure out the average and median interval hits, not just the average overall hit.
Here's an example. A mob has a damage bonus of 120, and an interval of 9. This leaves us with a a minimum hit of 129 (120 + 1*9), and a max hit of 300 (120 + 20*9). The mob can therefore hit anywhere in that range in intervals of 9: 129, 138, 147, 156, etc.
If parsing at 600 ac, you got an average hit of 255 you know that the mobs average interval hit is 17.2 (255-100 = 155/9 ~= 17.2).
If you then parse at 1100 ac and get an average hit of 200 you know the mobs average interval is (200-100 = 100/9 ~= 11.1).
That's a huge change in theoretically removable damage (damage bonus damage can't be removed)
Sorry to be redundant on that, but it's important to make that clear if you want AC parses to be meaningful. What mob you parse with matters. Ultimately I bet we're going to see a pretty linear change in average interval hit, on a per mob basis, as AC varies.
If anyone wants to provide those min/max/interval numbers on existing parses I'd be happy to plug the data in.
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