No I didn't factor in Diminishing returns on avoidance rating (I included Defense and dodge as the same at both providing 1% avoidance at 40 points) rating. If the amount of rating needed to up avoidance by 1% increases at some point, obviously that will throw off the model, but only at high avoidance numbers and only on the ratings that face such dimishing returns.

Regardless, the point wasn't to illustrate some magic target (although I can see where that target comes from) but to point out that the possibility of substituing Stamina for Avoidance in instances where Stamina is at or above the balance point but avoidance is below it. Eventually item levels do become so inflated you can't help but reach that point where avoidance beets out stamina and you want to leave your HP at that magic number, but until that number of item points spent in avoidance and stamina combined is calculated and defined, shooting for the magic number may not be the best option for a tank.