Actually, each enchantment is triggered separately. As in, when you're hit, it rolls for each and every enchantment on your equipment, which can result in several of the same triggering simultaneously.
I thought your FAQ said the chances are stacked, but not the damage? I'm confused.
Also, your FAQ hopefully has a typo when describing the Charm skill.
Cooldown 30 25 20 20 20 125 124
The cooldown on Charm doesn't REALLY go from 20 to 125 for no reason whatsoever, right?