Enchanter CHA over 200

[Daldaen]

I read a little on tests Loraen did a year ago on the subject but it wasn't anything concrete or definitive.

Does having CHA over 200 help charm duration / lull critical resists as much as CHA under 200, is it less effective than CHA under 200, or is everything over 200 superfluous.

My chanter currently is 20 and has 215 unbuffed CHA (231 buffed CHA) I'm debating about dumping some of that CHA gear in favor of AC/HP gear or INT gear. But I'm curious if anyone has figured out through trials or just through hours of gameplay, whether 201-255 CHA has a noticeable impact on charm durations and lull failures.

Also... How much CHA do you 60 enchanters run around with when charming solo or group.