http://ffxiv.ariyala.com/OBPK
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So I've been parsing my hybrid build. (i90 penta melds, Wootz penta melded) Puts me at 590 parry. My block rate and parry rate vary between 20-21%.
That fits into the ~13.5 parry per %. 590-341 = 249/13.5 = 18.4=9.75 = 28.15 80*28.15 = 22.52
I did about 10 t9s using the build and some attacks can't be parried so that supports the margin of error.
Going to use a different parry amount the next time we farm.