I got a good trick for you, if you want to place a bet on it ofc, I find that it works for my boomkin. If you unequip a trinket, and reequip it, the ICD will reset to 30sec.
Meaning you will not get a proc before 30 seconds, I had cases where I did get a proc but it was extreamly rare almost never saw them.
So I can suggest you to, on the pull timer, unequip and reequip your trinket at around 5-6sec, the ICD will start, and be ready for about when you are in a pool. I think its worth a try later