I just use my mage and his cleric merc...
When pulling with a SK, you end up with huge lag and mobs do the warp dance when you get a decent train following you.
However, when you use a mage pet for the initial tag and then run around tagging everything with a throwing dagger you can pull a much larger train without the warp dance...until you fade your pet.
The instant that you fade your pet the warp dance takes effect and since your merc healed the pet and you, when you fade your merc now has all the aggro and will just stand there healing himself.
Give him 30 seconds to lock the aggro.
I have a macro somewhere that takes inventory of all mobs in a 50 foot radius and tags them each with Throw Stone. (since you and your pet faded, the damage you did with your daggers is nullified.)
Now damage shield the merc heavily.
5 levels a pull is a fairly easy goal up to 75 or 80. The wolves, cats, and bears in Icefall work great... higher than that it's best to have an extra toon in the mage group with a healer merc on efficient or balanced to keep the main healer merc up.