So in NWN2, my main KC is multiclassing, don't ask me why, but I've never really understood why the XP with him and the rest of the party kept getting mucked up. I finally do realize it now, having finally discovered the multiclass XP penalty. Does anybody know how I can get rid of the penalty?

Yes, I know I can use the debug command "givexp", but the problem is that whenever I use it to give XP, it gives XP to the whole party, and if I try to reduce XP, it can only reduce the XP of the NPC I'm on, never the KC/PC, and even then, reducing XP with that command is very difficult, as the number I put in doesn't matter and it uses its own numbers. Like, for instance, if I put in a number that's too low, it does nothing, and if I put in a number around 130-ish and above, it recudes, like, two hundred something XP, and until I get around 500-ish, it gives that same number and then turns into five hundred something, and around a thousand-ish, it gives twelve hundred something. It basically ignores the digits I put in and goes by a number that's somewhat close but also isn't.

I want everybody's XP to be equal for them all to level up together at the same time. Just my OCD. Does anybody know a mod or something for this?

Edit: Forgot to post an update on this one. I found a mod that helped me with this and now I don't have the penalty anymore.

Yeah, because I couldn't figure that out by myself. Anyway, here's the link to the mod.

https://neverwintervault.org/project/nwn2/other/remove-level-adjustment-ecl

The author is Ugly_Duck, and it's called Remove Level Adjustment (ECL).

That mod removes the ECL not the multiclass penalty. ECL is just a flat adjustment in the EXP table for a RACE.
Multiclass would be making a rogue/barbarian yuanti. Which would receive a 20% penalty to EXP earned