Hello there !
I’m looking into the azerith trait available for Healer called “Azerith Veins”.
Compared it for my mistweaver on a vectis MM fight. Script is based on hm Vectis.
In MM we have generaly more dmg taken specially with Vector and the soak (that leaves a dot on you).
So “Azerith Veins” should have more chance to proc.
Source : https://www.warcraftlogs.com/reports/P8T4Mb17FLwRQzrD/#fight=20&type=healing&source=21
Compared to a simulation :
We can see Azeith Veins is procing more often on simulation than on logs (for my specific caracter).
And fore tank it has proc only one time for Zul MM (i was soaking all fight motsly so possibly it only proc on physical dmg taken.
Source : https://www.warcraftlogs.com/reports/4tr6GNqdAHBkJw3p/#fight=last&type=healing&source=14&ability=270674
Hope it help.