Blizzard has done tuning on raid trinkets including buffs to Spiteful Storm buffs and a change Whispering Incarnate Icon to make it raid-wide.
Blizzard
Items and Rewards
Fixed an issue where Blazebinder’s Hoof would not trigger off certain melee attacks.
Raid Trinkets
Developers’ note: Overall, we’re happy with how trinkets & itemization is working out in Vault of the Incarnates.