The only times i get an initial resist on charm is if the mob is too high of a level for that charm (52+ for allure.)
About the only time I run low on mana is if I get a bad string of charm breaks shortly after rebuffing. So even if the marginal increase is less after 200 cha I still prioritize cha over int.
My understanding of how charm duration works is that every tick there are 3 checks: MR, lvl vs lvl, and charisma. The mob has to make all 3 checks in order to break charm. This is why if you are charming a green you don't need a very high charisma, but if you are charming something on the edge of danger you need every bit you can get because the mob is probably making its lvl check every time and MR is a crap shoot.
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