The amp PROC trinket is EXACTLY what I mentioned in my post if you cared to read it :P
My point was that the removal of such trinkets and the RPPM changes made it harder to have a ridiculous first combustion and that was a nerf in itself to specs such as fire/demo. This combustion nerf seems a bit too heavy.
Also, the trinket was removed because it got a bit insane for certain classes like fire and demo because they are able to squeeze a large portion of their dps output within the proc period. It doesn't bother anyone because that was certainly the right decision to take by blizzard - those trinkets were too powerful.
Mew!