I’ve now fully upgraded all three Blood Shards.
ddf3695c7ffc40fb97ee9e93ac1e3ba7
With the Blood Shards in BiB wants me to swap to the Frost ones for a 2.98% upgrade but the sim results show it’s 1.5-1.6% lower, depending on Windfury.
That puts the BiB recommendation about 4.5% behind, which is no longer in your error margin. 
No Windfury.
9,302 DPS BiB gear.
9,449 DPS BiB gear with Blood Shards.
With Windfury.
9,581 DPS BiB gear.
9,726 DPS BiB gear with Blood Shards.
I hadn’t really looked at how much gain there is with Windfury as I have no control over getting it.
I was surprised to see if was 3% higher!
Export in case it's needed.
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