Charisma - for the lulls!

[Shodo]

So i've been soloing dungeons a lot lately while doing homework, and as a result have had to make obscenely prolific use of soothe. Unfortunately, I get crit resisted around 20-25% of the time. I've read that level is the major component in these resists, but some people have also suggested that carrying some charisma gear might help.
Does anyone know of a magic number one should shoot for to not get a stupid amount of critical resists? Would 20 or 30 extra be enough to see a big impact? I'm currently sitting at 55 charisma as a dwarf paladin, so there's a lot of room for improvement.

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