My experience of Fetlife seems to be different from yours. I've found that most of the members are open minded and like a bit of experimentation, wheather that be in fetish wear, power exchange, rope bondage, photographic techniques, kinky trips, etc.
For instance the main girl I used to play with had a steady girlfriend and a few other play partner males. She wasn't looking for a relationship with me. The other girl was dating a guy who crossed dressed and again had a few males she would play with. So that was my point of view of the site, but I also know of males that have a sort of hareem of girls that also play together.
I would think it would be highly unlikley you'll find a girl who advertises specifically looking to kick males in the shins, however find a girl who wants to explore her sadistic side and you might be in with luck
One thing to remember is that your eroctic fantasys have been going round your head for years and you have explored every detail to the nth degree, there is no way you can convey that in a couple of messages and hope to experience your exact fantasy. In the long run you'll get closer though, so stick in.
Another option is to stick with a pro-domme and each visit fine tune the session a little bit, most pro-dommes will be happy to work on the scenario if it means repeat business.