I've been paying close attention to damage intake at 70 and theirs one big thing I have noticed. Tanking damage is VERY spikey. I'm at 3400 AC on Jeido, yet Kael mobs or even Ssra mobs can still give me a severe beating if they get a good spike in. The thing is that the mobs either chain miss, or chain hit for near max damage. The only thing I can think of regarding this is that their accuracy must be too low, and ATK too high.
I know AC works strangely after a certain point, and it starts to make mobs accuracy go down the tube. What I am proposing (and seriously hoping will be considered) is that mob accuracy be risen, and attack be lowered zone-wide, mob-wide for all level 70 content except for group exp zones. (they're fine atm) I am not saying that the mobs should be made easier, rather I am hoping the damage will be more consistent so a tank doesn't go from taking little to no damage for 10 seconds and then the next 10 get SLAMMED for max hits due to the ATK on these mobs tearing through our AC/AA "mitigation". This makes tanking very stressful, and healing as well since it is like healing someone who has 0 AC one minute, then someone whose got 100% melee avoidance the next.
By lowering attack and raising accuracy you will both allow mitigation to actually do it's job, as well as counteracting the problem where AC makes mobs chain miss once you start to reach the 4k mark.
I hope you guys will consider this, and I'll be awaiting to see what you say...