I can get more XP by talking to my shoes.
Just don't talk down to them, they hate that.
Anyway, just wanted to mention that, for what it's worth, I completely overhauled every single Sahuagin critter in the game (and sent them to Weimer, but I hear he's on vacation), and my method of EXP smoothing was to have the EXP awarded for each kill be 0.5% of the EXP that that creature would have needed to reach its current level. King Ixilthetocal is a Level 20 Fighter, which means he needs 3 million EXP, which means you get 15,000 for killing him. In comparison, the "roadkill" Sahuagin that you find in places like the Planar Sphere are worth around 42 EXP. The Healing Potions they carry are also based on this calculation.
The downside to this method is that it only works on creatures who are of a legitimate Class--calculating the EXP required to become a Level 13 Mage is easy, but what do you do with a Level 4 Ogre?