I always use the lower level charm. I didn't notice any duration difference with the higher level charm and it costs more mana and has a longer cast time.
Be keep your sure target rooted. That way if charm does break you only have 1 thing beating on you instead of two.
And don't forget about the pet back command. I did for a while. ;(
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Apog - 58 Halfling Druid <Azure Guard>
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