It won't necessarily be a better recast (and most of the time it's the same value), due the way haste and fast cast are implemented. The formula is
(1-haste)*base_recast truncated to the first 10 th
Then multiply this by (1-fast_recast) and floor the value
In the exemple of stoneskin (30 sec recast) :
setup A : turban+goliard+swift+dusk gloves+nashira legs+duskfeet haste(spell) = 35% (351/1024)
trait(10%) loquacious (1%)=11% (112/1024)
17 sec recast
Setup B : swift+dusk gloves+nashira legs+dusk feet haste(spell) = 26% haste (261/1024)
trait AF1 chapeau AF2 body loquacious (21%, 214/1024)
17 sec recast
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