I do like how Tarkin can just come out swinging under EP, but I agree - he just doesn't do enough, he needs a little something else.
I forgot that Magma's thermal can't crit, so no AB there - but his basic can, don't think the secondary effect can though, but the potency and TM reduction is definitely there.
I was wiping TM left and right on GW today.
Krennic's Death Trooper Assault with the high stagger percentage, then DT assists. If it's a rebel target, DT attacks twice. If DT crits, it's automatic ability block. Then since a good majority may have stagger, any damage taken reduces TM by 20-something percent I think. Almost anything after that is almost gravy IMO. Magma's thermal will pretty much take all TM down to nothing, and any damage at all leaves them all just standing there like punching bags.