I haven't gotten to abyss yet, thou i am doing hoh/t4 so i can only speak of what I've seen so far.
I gathered that clerics were only allowed to use the aug because relatively speaking, most people 5 or 6 box max.
-Now i did say "most" and please i dont want or need a post here flexing your computers e-peen "i cans has 10 boxes open and still crunch math for cern" I build computers for a living,I'm totally not impressed. And no one cares.-
The couple thousand proc was given to compensate for the fact that these mobs have literally millions of hitpoints, and your 300k plus tank will still be getting one shot deaths at times. t5 is on the edge of insanity in the way of timesink of numerous mobs you must kill to spawn bosses and the hitpoints they have.
so long story short- I'm sure that if there was a way to keep people from using damage augs before t3 im sure it would have been implemented by now, so enjoy that it isnt, and dont ask for more. Because that is what always leads to class nerfs.~until the next tier release if any~
No matter what you give people, they just want bigger guns.