Regarding ch/priest
Divine Vengeance: Should be changed into selfbuff click and with uptime 20 seconds / cd 15 seconds. Right now it's very uncomfortable to click it every 5 seconds as a hit on mobs (and you need Chain Drive to be triggered before)
Personally, from a dps perspective, I like the new Divine Vengeance since it helps with the terrible single target damage of the class. However, I realize that using it for the buff is rather annoying right now.
I suggest moving the ability to wear plate to Way of Frenzy (lvl 35 elite). A elite skill that only allows you to wear plate and does nothing else is kinda weird to begin with if you compare it to similar skills of other classes.
Runecraft-Devotion (lvl 15 elite) can be changed into the selfbuff you suggested (the buff needs to be removed from Divine Vengeance accordingly).
That being said, only the devs can tell if the buff is intended to have an uptime next to 100% or should rather be seen as a temporary bonus like Wd/W's Pulse Mastery (lvl 35 elite) buff.