If you want to promote the voluntary measures, you say that you are pro choice, pro birth control and believe that parents should have the right to improve health of their future children
AFAIK very few people use the improvement of the genes of the next generation as an argument in favour of pro-choice or pro-birth control positions -- such an argument would be automatically frowned upon by mainstream political circles, exactly because it's seen as "eugenics" (and hence racism) even without any coercion.
And "improve health of their future children" has the connotations of just avoiding disease or disability, rather than e.g. also increase the potential for high cognitive skills.
All in all I think I think that something like "I'd support strictly voluntary eugenics" would be much clearer in intent than what you suggest -- shorter too.
You can already choose to have or not to have children, or choose the mate, based on what ever motivation pleases you, including the notion of improving the human race. It's sort of like saying "I support strictly voluntary segregation". Whites and blacks already have enough freedom of movement to segregate themselves all they want.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.