I realized when I compiled the first option (still haven't had a chance to test it) that I failed to initialize racemod and classmod properly. They should have been initialized equal to 1.0, default for any of the non-modified races/classes. Oops.
Code:
float racemod = 1.0;
float classmod = 1.0;
I think I'll have a chance to test out the modification of that function tonight. Before I get much further into this, can anyone at least confirm that my memory of the modifiers is correct as far as them modifying xp per level, rather than xp gain per mob?