I just want to mention, you said you are using the build Ashe - Carry Ranked Games, which is probably this guide. It is a season 1 guide and hasn't been updated for a long. That's why the build is also not up-to-date. For more current Information on ashe and building her I reccomend you for example jhoijhoi's Ashe guide or astrolia's Ashe guide which are both very good.
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Summoner's Wrath is useless on an ADC and Havoc is inferior to like any other mastery