As a warrior i dropped mine, Surviving is more important than my threat, i can lose alot of TPS before it poses a problem to my raid's DPS. is having 10 percent smaller lacerate crits going to have much of a survivability detriment and is thing going to be outweighed bt the greater amount of stats having a piece of t12gear is.
i think 11k is normal for a tank. 16 seems a bit high but maybe its due to gemming agiliy? that's effectively AP and Crit and Dodge. Plate tanks generally don't gem strength, which is AP and parry. what we gem doesn't offer much of a direct DPS increase.