Bard AE Mez

[Kekephee]

I just wanted to start a discussion here about bard AE mez, Kelin's Lucid Lullaby. I had an experience the other day that made me realized I don't really "get" the mechanics of this song on a deep enough level. I was powerleveling a friend in EC by pulling a bunch of mobs, using AE mez to keep them from swarming him as well as to hold aggro on them- it makes a great taunt in addition to keeping mobs under control, and what ended up happening was he was able to just down the mobs one by one without taking any damage-and I noticed at level 40 an unbelievable percentage of my casts were getting resisted. I would say each mob resisted about half to 75% of the mez casts. These are level 5, 6, or 7 mobs, and I couldn't even keep them mezzed. Later that day, I went into Sol B, where every time my group would pull multiple mobs I would cast my AE mez and the level 35 kobolds were kept pretty under control- I had a couple resists, but it mostly worked- by the same mez. This was a pretty pleasant surprise, as lately my mez has been seeming less and less reliable, but never as bad as it was in EC.

What's the deal? Why do level 5 mobs resist while level 35s don't? I have 145 cha, which Ive noticed has helped my charm a great deal and seems to have cut down the resists on my mez, but what's the deal?

I made this thread because I figure if someone has the answer to this question, it will probably involve a few bits of information that will help me be a better mezzer anyway.