farm only whites and convert them to yellow mats , i only farm yellows this way , try to gather only whites in your rifts, try to play paladin quest in act5 story mode to get 9 10 whites in 1min (dont forget not to end quest), or farm those whites in north section of leoric castle (skeleton archers and shields on the walls) over and over, and then convert your whites to yellows from cube.
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farm only whites and convert them to yellow mats , i only farm yellows this way , try to gather only whites in your rifts, try to play paladin quest in act5 story mode to get 9 10 whites in 1min (dont forget not to end quest), or farm those whites in north section of leoric castle (skeleton archers and shields on the walls) over and over, and then convert your whites to yellows from cube.