Just curious how much tenacity you're running on Magmatrooper in p1, if you're doing that team. Mine's only at G8, but we're only doing T4 so I figure that should even things out--except my Magmatroop...
I have him with a cross and 2 tenacity sets and a crit chance or potency set with crit damage triangle. He never got a debuff once and went crazy. He alone got 600k and is only g8. T4.
I run him in my trooper team normally and always have him modded this way. Hes one of the few people to always benefit from tenacity mods.