Originally Posted by
Pippilongear
On the very few fights where they make sense this tier (siegecrafter belt duty is all I found them useful for), you don't use them on the opener anyway but when they were relevant (T14 and T15 for some fights) their most important buffs were trinkets and meta gem / Bloodlust. Because of the lag that they had with their cast times and temporary haste buffs I found it best to make sure that I popped them 1 or 2 seconds after Bloodlust or the meta proc (trinkets were usually up at that point in the opener anyway).
The only one thing you are missing in your opener is the Wild Mushroom: Detonate which help you proc your trinkets faster.