I Dont know my exact A2 numbers since I play on console (1.5k+ last time I asked the friendly PC players of my group) but in regards to rockbreaker I use it in waves 3,4 and 8 mostly, I couple it with pb when its up. You can get purification off up to 4x in A2S, mix that in with invigorate and you should be alright. Would be interested in hearing what numbers are pulled in A3S though.