You will probably need to find a very close relative of your biological father for him/her to know anything about the situation. It would be a good idea to test at the other two firms to increase your chances. You can transfer AncestryDNA results to FTDNA at a small savings. They are likely to have a sale on the transfer around DNA Day (4/25/2014).

I would also have your birth mother test. You will then know that any of your matches that do not match her are from your father's side of the family.

It would also be a good idea to enter your data at GEDMatch. They have a number of tools that might be helpful, although they seem a little complicated at first.

Aiken looks like a possibility. You might try looking through her yearbook for classmates, if the birth occurred while she was in school. If she does not have one, there are a number of sites which have them. If you know a person's age, he can probably be found through search firms like Intelius.