I have been messing around with the Wench Coalesced Editor to edit some power properties for the Soldier class.
Now it seems that the Concussive Shot has - in part at least - some locked values that can't be changed by editing. It's located under
biogame.ini >sfxgamecontent > sfxpowercustomaction > concussiveshot
I can change values of the evolutions (ranks 4-6), but the first three ranks seem locked. Which is strange, because I could change any other power at any given rank. Furthermore, the base damage is also way off, based on the Mass Effect Wikia (rank 1 = 200 damage instead of 100). This means, the value must come from somewhere else. I don't know, whether or not it only applies to Concussive Shot or if there are other powers with similar restrictions.
Why is Concussive Shot only partially moddable?