For those who want to take life juuuust a little slower.
This mod raises the amount of exp required to level up for the Player Character and all Partners. There are multiple versions:
Version 1.120 multiplies the required amount of exp to level up by approximately 1.72
Version 1.140 multiplies the required amount of exp to level up by approximately 2.74
Version 1.200 multiplies the required amount of exp to level up by 8
(Yes, that means even Version 1.120 almost doubles the exp required to level-up.
I would strongly suggest not using Version 1.200.)
This version of the mod combines Slower Leveling with Better Partners, giving you both. Your partners are stronger, and you level up slower. Kinda self-explanatory, I guess.
This mod should be completely save-safe to uninstall - the exp required for level-up is recalculated upon leveling up, so just reach the next level and things should go back to normal.