Don't know if you're still searching, but I was born in Houston, TX on February 3, 1968 and adopted 9 days later (taken to Austin, TX). I'm male.
I noticed your user name. I have a letter from my maternal mom saying my name was suppose to be David. I believe I'm also from St. Marks adoption and I was born in the Houston area, October '86. It's a long shot but thought I'd ask. You're saying you where born around the same year as my maternal father ( not sure his exact age).