Some of those Hook Horrors are tougher than others. The Guardians, for instance, are nastier than the usual kind (there's another version of the HH that's mean, but I forget the name of them offhand).
This is true of all monsters/enemies in the game. So some will give you experience, and some won't, depending on what your level is. There isn't much you can do about it.
If you're playing at the regular difficulty, figure your party will average about level 16 by the end. You're pretty close to that right now, so it may not be surprising you aren't picking up a lot of experience.
Nightowl2
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