I think the best option for Counter Barrage is SUPER lower scatter, so it can actually hit lazy players, and allow counter play.
Change FoW scatter mod to 1, change the other scatter modifiers to have a max scatter of 3-5 ish. go back to 160 damage, or 159 to give rocket arti a chance. Or not, either way.
Then, give this to the ML/20, so there is incentive to not put arti near the front lines, and this counters face hugging death rocket arti.
So make it an insta win against any static arty piece? Why is that a good idea? I agree with OP that counter barrage should be removed but more so from everything, arty is very very powerful and should require babysitting to get the most out of it, no a click, win and forget button.