Ranger help

Hey everyone, I've been trying to run ranger with a focus on ice. Well, at least that's my plan, however, right now, I'm struggling with regular mob packs. My DPS for boss fights hasn't been an issue, but as far as trash mob packs, I'm struggling. What AoE skill/spell should I run? I've been using contagion and just auto attacking and that got me through to the graveyard area, but not my clear speed is drastically lowering. Any help is appreciated, thanks for your time.