TAKP Magelo will show you your current unbuffed Mana pool. I find it updates every time you zone or see a "Soandso saved." message. Also, the source code for max mana is here: https://github.com/EQMacEmu/Server/blob/main/zone/mob.cpp#L785 Looks like it's basically ((INT/2+1) * Level) then plus item and spell bonuses.
Ya, that equation would give you nearly 10k mana for just being level 65 : ) It seems to be used in all the right places though. I'll have to dig some more huh?
https://github.com/EQMacEmu/Server/blob/main/zone/client_mods.cpp#L834 Ah, there we go. Much more complex. You're right, there's a breakpoint at 200 int/wis, and above that you get exactly half the returns (expressed by MindFactor). So you get a certain amount of gains from mind factor from 0-100, and then another from 100-200, and then another from 200+. Code: [ Only registered users can see the bbcode. Click Here To Register... ]
Here's quick lookup table for level and int/wis starting at 55, counting by 10s. Code: [ Only registered users can see the bbcode. Click Here To Register... ] edit: Extended out to 355, cause I forgot about those PoP AAs, and stepping by 10 to fit the sizd limit of a post.