This is the method i use to farm out the Burrower Silks. My first attempts i used velium hounds only for the shear amount of damage they do fast. The problem with them is how frequent they break charm early. I very much enjoy using the brontos as pets, they hit slower, but do larger hits per round. They are a slow running mob but have little to no trouble keeping up with burrowers are long as your cirlce is tight. And bet of all they rarely break charm early. The only slow part of killing a burrower is the initial 20% damage you need to do before you send in your pet. The burrowers hit hard fast, the dispell is ugly and they will eat a pet FAST if the pet gets aggro and isnt dispelled right away.
And yes camp a monk, luckily my monk is on a diff account so i leave her FD'd in the middle of my kite path for some easy exp. The first time i killed a burrower it dropped the bp, but my monk was no where near. Now that i bring my monk the bp has yet to drop again, what luck.