this is great avice - use the ally song to your advantage. i also like to keep Highsun memmed so i can send away any roamers, ie in stoneroot falls, those godawful witherans wander through walls and all over the zone, interfering with your charm kite (they don't assist shadowmanes.)
what i've found to be more useful than mez, is using Largo's/Dirge/Selo's constant chain - it takes a few tries, but if you think of yourself as planet earth and the mob in your pack you want to charm as the sun (in this case the sun moves in small circles), occasionally on each pass you will be just within range for your charm song. i find it more effective and simpler than running my pack away, especially when charm gets resisted right as the pack closes in on me, so then i have to start all over again.