I just saw the game rankings for race.... but woah... literally undead makes up ~50% of the entire server in either true, primary or sub pick, and the rest is mostly T/M pick... if you think about it it means the undead is hands down the best pick as a sub-race pick vs all other attacking choices.
From a players perspective its interesting age akin to the day of the dead age (hurray Halloween) but on design side it means the hybrids is overpowered.
So anyways I suggest to either give True Race a special ability/bonus OR give Hybrid a reduced version of the race or a flaw for the ability to "cherry pick", (in a way it is similar to DnD depending on which way your thinking for Class & race).
Just pointing out the fact and giving out an idea... not too sure how your going to do it or if you agree with me or not.