I've read all the stories by GoldenMage, ElSol(by far my favorite author), cmix & mpn3000. I'll check the other authors out, thank you for the recommendations. I'll also check out the erotic mind control story archive.
I don't mind if they're not really slaves, but usually those stories fit my tastes more often than not.
I also may have mischaracterized what I don't like about female characters in these stories. Its not that they don't have any character development really, its that there is no conflict. The women in most harem stories don't seem to have their own aspirations or feelings and their only motivation is that they love the MC. Most of the time they're introduced in one chapter and have some sort of problem, by the next their issue is solved, they're in love with the MC and will do anything the MC says without reservation. For shorter stories it works very well, but when it comes to the longer stories it just becomes repetitive.