I wouldn't suggest supplements for that purpose. The area is full of snake oil. Avoid environmental toxins in addition to your current interventions. High estrogen is only an issue once you've passed menopause. I assume you have read this. http://en.wikipedia.org/wiki/Anti-oestrogenic_diet
. Ori Hofmekler has written on the subject as well. (Edit: the #1 item in the bibliography at the bottom of that page) In general, read what you can but understand that there is no proven magic bullet so take everything you hear with a grain of salt.