Body armour evasion rating calculation incorrect

I have the following item:


Item Class: Body Armours
Rarity: Rare
Damnation Coat
Expert Studded Vest
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Quality: +20% (augmented)
Evasion Rating: 2310 (augmented)
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Requirements:
Level: 70
Dex: 102 (augmented)
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Sockets: S S
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Item Level: 84
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40% increased Armour, Evasion and Energy Shield (rune)
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+286 to Evasion Rating
109% increased Evasion Rating
35% reduced Attribute Requirements
+37% to Cold Resistance
34.5 Life Regeneration per second


If the total evasion rating is calculated as follows, then the item is giving more than it should:

(Base Evasion Rating [487] + 286 to Evasion Rating)*(1+1.09+0.2+0.4) = 2079

The multiplier is 100% Base + 109% increased Evasion Rating + 20% Quality + 40% rune

If this is not how the calculation works, please help my sanity by explaining how it should be.