the new FBoC really don't want tanks to mitigated damage with block/parry, or something's off with the new BiS sets when it comes to tanking.

The most possible parry you can reach is somewhere in the 640-660 range, but it pretty much destroys all your other stats (since the only other stat you can gear doing that much parry is just accuracy).

Though its weird you say they don't want you to mitigate damage that way but all major damage can be pretty much mitigated through block and parry despite for a few attacks.

T10: Critical Rip can be block/parry... I think the Charge can too but not sure off the top of my head.
T11: Resonance, Main Head can be blocked and Parried
T12: Extremely Strong AA and Revalations can be Blocked and Parried (along with Sharp Beak and high AA damage from first Bennu's)
T13: Strong AA, Flatten, Death Sentence can all be Blocked and Parried. (Breaths and Ahk Mourn are the only major moves that cannot)

Its more that they WANT you to mitigate through block/parry, instead of just gearing DPS stats (well Crit) and cool downing everything though you can do that too This will be the highest parry and block you should be able to achieve before 3.0... they'll adjust the formulas for the new level cap so that it takes more than 13 parry for 1% parry rate etc.