[charleski]

Finally, what about magic resist? Does that have an effect on charm duration?

I haven't formally tested this yet. This is largely because, as mentioned earlier, I frequently notice charms that last so long that tash wears off, which obviously will have a confounding effect on the succeeding trials, and I'm not sure how to handle these instances.

But frankly, the question of magic resist is largely moot anyway as we know for sure that MR is important in handling charm breaks. When charm breaks you go through the stun-L4mez-reTash-reCharm cycle (strung together with the clicky exploit) and landing the stun and mez are essential components in making that happen smoothly. Successful charming means successful handling of charm breaks, and keeping the mob's MR low is a critical factor in that.

So those Rusty Spiked Shoulderpads are indeed a useful addition, just not in terms of increasing charm duration.