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is the extra armor and block worth the drop in parry and dodge?
not sure why you would see 2% drop in parry and dodge. parry should have dropped about 0.4% and dodge should have actually gone up by about 1/2%.
in basic terms, it takes 18.9 dodge rating for 1% avoidance and 19.7 defense rating for 1% avoidance. so the change in shields results in an overall loss of 0.266% avoidance (1.218% - 0.952%) as well as 2 stam.
in exchange, you get +72 block value & +13 hit rating (big threat increases), and well as 1161 extra armor. the armor alone easily makes up for the avoidance and stam loss - go ahead and vendor your old shield.
however, sitting at 492 defense and less than 13k hp, i would have gone for the stam enchant on the bracers.