Anyone Have Data on Block and Parry Percentage?

[Maelwys]

Most people, including myself, have been told that parry rating only affects the amount of parries while strength determines how much you mitigate. Personal testing, however, has shown that increasing parry while strength remains the same has resulted in me parrying for more. At the base str of a i90 pld with 30 in vit and 583 parry rating, I mitigate 24% of damage.

Also, since the game has been shown to check parry before block, (ie it checks to see if you parry, if that check fails, then checks to block), I doubt a higher block rate shield would help much. As your gear improves your parry rate gets quite high. Accordingly, your combined parry + block mitigation rate is very high.

Blocking happens BEFORE Parry.
As a PLD, Parry chance takes a noticeable backseat whenever you activate Bulwark.

As far as I am aware, the order is:
Special mechanics (i.e. "is cover in effect?" or "has the target broken line of sight?") -> Dodge -> Block -> Parry -> Defence and Resistances (including special types such as Hallowed Ground) -> Impact.

If bulwark is simply additive, as the tool tip suggests, you would have a block rate of 102% making it an extremely reliable cool down (in this case equal to rampart's mitigation). What if bulwark isn't additive, but rather if you miss the block chance gives you a second block chance at 60%? still strong, but not 100%.

Bulwark is a straight 1.6 multiplier to your Block Rate, not an additive buff.
If it was additive, it'd be a LOT more powerful, to the point where it'd nearly guarantee that you block every attack when you're using the Onion Shield.

I do hope someone answers your question as to block rate and parry rates.

The most reliable source of data for Block/Parry RATE testing that I've uncovered so far comes from a Guy on Reddit called Kestiel. The thread linked has stats on the Onion and Allagan/Holy shields, but he's also posted some other numbers in the past which largely tie in with what was previously posted by Ninjiitstu and Ruckus.

Basically, a good ballpark figure is ~25% Block chance for the Allagan/Holy shields and ~35% for the Onion.