what is the cost of having that much more AC?
Does the low AC char have 51 AC and the high AC char have 70? Or does the low ac char have 30ac to the high ac char of 75?
Yes, the difference in damage taken can become astronomical. But the cost of gettting that good AC is also astronomical. AND the difference in DPS is also astronomical.
I also find it interesting that you had to back down from your chosen AC split and go to a more extreeme one to continue the debate. I think you can do better, my friend.