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Confused about IAS breakpoints on Zeal/Smite

So I got a Redeemer today. According to 1-pt smiter guide I'd need a Shael on it plus an additional 20% IAS to make it hit max zeal/smite speed, in other words 40% IAS in total (with fana 20 on).

But the IAS calculator claims I need 60% IAS for the last Zeal breakpoint and 55% IAS for the last Smite breakpoint.

So whats the case?
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