Hi SS!
Interesting points. I'm also a feminist and a submissive, though I don't think I agree with your whole argument. I think what I find most comforting about the BDSM community as a feminist is the fact that gender doesn't determine whether a person is Dominant or not; it's just based on which way makes them feel more comfortable. Especially being bi, I feel that if I trusted and loved another woman, I could be happy submitting to her the way I do to my Master.(not that I fantasize about Dominant women... very much... per week...
)
Basically, I don't think that it's a contradiction for a feminist to believe in doing what makes him or her happy, as long as it doesn't hurt anyone.