Ok, thanks for the info. But seeing the initial post:
Parry% = 3.588 * dodge% - 10.757
Parry% = (3.588 * 8.69) - 10.757 = 20.422%
Seeing that I don't use the Rune of Swordshattering, I guess I need to deduct 4% from the total, making it 16.422%.
The macro (Without swordshattering) returns an ideal parry of 12.78.
What's the discrepancy between them then?