Inkblot or Fog generally force them to come to you if you're grouped up and use it on your party. That tends to get them to funnel nicely to you, and if they don't, they'll be missing a lot while you poke in and out to attack them. They also have a tendency to group up on webs, so you could always destroy those so that they take a ton of damage and fall prone. Line of sight abuse is also your friend.