For the worm packs I just drop 5x Novas and 1-2 thunderstorms and they all instantly die, as long as you time the nova drop correctly during the pull you can escape taking minimal damage. If you miss it on a pull you can fallback on using all remaining thunderstorms
Also try hitting up HM if you haven't yet, the difficulty seems to be pretty much on par with normal mode with bosses 1/3/4 being just as easy. Trash is a joke with thunderstorm/groundings, havent even tried it sense the nova stun change but thats a nice buff. Biggest difference is really Vexellus where you can't just zerg him down but you need to kill adds/heal/take it slow
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